What is Conducting: Definition and 561 Discussions

Conducting is the art of directing a musical performance, such as an orchestral or choral concert. It has been defined as "the art of directing the simultaneous performance of several players or singers by the use of gesture." The primary duties of the conductor are to interpret the score in a way which reflects the specific indications in that score, set the tempo, ensure correct entries by ensemble members, and "shape" the phrasing where appropriate. Conductors communicate with their musicians primarily through hand gestures, usually with the aid of a baton, and may use other gestures or signals such as eye contact. A conductor usually supplements their direction with verbal instructions to their musicians in rehearsal.The conductor typically stands on a raised podium with a large music stand for the full score, which contains the musical notation for all the instruments or voices. Since the mid-19th century, most conductors have not played an instrument when conducting, although in earlier periods of classical music history, leading an ensemble while playing an instrument was common. In Baroque music from the 1600s to the 1750s, the group would typically be led by the harpsichordist or first violinist (see concertmaster), an approach that in modern times has been revived by several music directors for music from this period. Conducting while playing a piano or synthesizer may also be done with musical theatre pit orchestras. Communication is typically mostly non-verbal during a performance. However, in rehearsals, frequent interruptions allow the conductor to give verbal directions as to how the music should be played or sung.
Conductors act as guides to the orchestras or choirs they conduct. They choose the works to be performed and study their scores, to which they may make certain adjustments (such as in tempo, articulation, phrasing, repetitions of sections), work out their interpretation, and relay their vision to the performers. They may also attend to organizational matters, such as scheduling rehearsals, planning a concert season, hearing auditions and selecting members, and promoting their ensemble in the media. Orchestras, choirs, concert bands, and other sizable musical ensembles such as big bands are usually led by conductors.

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  1. A

    Hollow conducting sphere in external E field

    Suppose I put an (uncharged) hollow conducting sphere with inner radius a and outer radius b in an external electric field in the positive z direction. Apparently, the potential INSIDE the sphere -- that is, for 0 < r < a -- is zero. Can someone explain why this is? I understand that the...
  2. F

    Magnetic induction of infinite conducting sheet using Ampere's Law

    Homework Statement http://i.imgur.com/j3uzQ.png" to screenshot of question Homework Equations The "Integral Form" the question refers to is the http://upload.wikimedia.org/math/0/3/1/0311484f33c932135c09ab12ca8d1a29.png" The Attempt at a Solution The hint hasn't really helped me...
  3. F

    EM waves and conducting surfaces

    Firstly, I'm a bit confused about EM wave propagation. Take the picture you see everywhere illustrating the perpendicularity of E and B in a traveling EM wave (like this http://web.onetel.net.uk/~gdsexyboy/em_wave.jpg) -- does that actually illustrate the magnitudes of E and B at a particular...
  4. B

    Conducting spheres Gauss's law

    Homework Statement There are two conducting spheres, one hollow outer sphere which originally had +60nC of charge on it, and a smaller inner sphere enclosed by the hollow outer sphere which contains +20nC of charge. Homework Equations INT(E.DA) = Qenclosed/epsilon0 The Attempt at a...
  5. C

    A conducting rod slides down between two frictionless vertical copper tracks

    Homework Statement A conducting rod slides down between two frictionless vertical copper tracks at a constant speed of 4.5 m/s perpendicular to a 0.56-T magnetic field. The resistance of the rod and tracks is negligible. The rod maintains electrical contact with the tracks at all times and...
  6. S

    Force on a conducting ring due to solenoid with AC current

    Homework Statement A long circular solenoid of radius a and N turns per unit length has its axis in the z direction. A small highly conducting ring, or area A, resistance zero but self inductance L, is place with its plane horizontal and its centre on the axis and near the top of the...
  7. F

    Current Between Long Straight Conducting Wires

    Homework Statement Two identical long straight conducting wires with a mass per unit length of 25.0 g/m are resting parallel to each other on a table. The wires are separated by 2.5 mm and are carrying currents in opposite directions. a) If the coefficient of static friction between the...
  8. H

    How Does Charge Affect Electric Field in Spherical Shells?

    Homework Statement What is the electric field if r=a and r=b? Reference:http://www.youtube.com/watch?v=BcuQ2c_WrMc" 2:11 And what if the net charge is just -Q on the conductor instead of -3Q? Will the electric field at r>b be 0? Reference: Same video, 3:00-3:10 Homework Equations...
  9. S

    Potential inside an non conducting sphere given the potential on the sphere.

    Given the equation for the potential "on" a non conducting sphere how can the potential and electric field inside the sphere be calculated? If there is a potential on the sphere am I to assume that there must therefore be a charge build up in the sphere? Is this just calculated by the Laplace...
  10. K

    Mutual Inductance of a conducting loop and a solenoid

    Homework Statement A 0.100m long solenoid has a radius of 0.05m and 15000 turns. The current in the solenoid changes at a rate of 6.0 A/s. A conducting loop of radius 0.0200m is placed at the center of the solenoid with its axis the same as that of the solenoid. Determine the mutual...
  11. P

    Ohm's Law: Coaxial Cylinder Resistance & Density

    Homework Statement Consider two coaxial conducting cylinders with radii a and 3a and length L. The region a<r<2a is filled with a material of conductivity σ1, and the region 2a<r<3a has conductivity σ2. (Assume ε1=ε2=εo.) The inner cylinder is held at potential V0 and the outer cylinder at...
  12. B

    Calculating Forces on Two Charges Above a Conducting Sheet

    Homework Statement Two charges +Q and -Q are a horizontal distance a apart and a vertical distance b above a large conducting sheet. Find the components of the forces acting on each charge. Homework Equations The Attempt at a Solution Ok well I've tried to solve this using image...
  13. S

    Electric Fields and Gauss' Law with a Conducting Sphere

    Homework Statement This isn't about a specific problem, but it is based off of a homework problem. There is an insulating sphere (from radius 0 to a), and it is concentric with a spherical conducting shell (from radius b to c). If I know the charge of the insulating sphere and the net charge...
  14. N

    How Is Work Calculated When Moving a Charge Near a Conducting Shell?

    Homework Statement Find the work done to move a test charge with charge q from the origin to the edge of a spherical conducting shell which surrounds it, also of charge q. (Shell is of radius R). Homework Equations W = int(F.ds) where W = work done, F = force The Attempt at...
  15. C

    A charged conducting wire in an electric field

    Suppose I have a wire with a net charge (lets say negative) in a uniform electric field from another source, such that the field lines are parallel to the wire. I want to work out the electric field surrounding the wire. Because the wire is conducting, the electric field inside the wire will...
  16. P

    Conducting and nonconducting cylinders; Finding electric field.

    1. An extremely long, solid, nonconducting cylinder of radius R1 = 50 cm has charge density given by p = kr, where k = +2.0 microCoulomb/m^4 and r is the distance from the center of the cylinder. It is surrounded by a solid, conducting, cylindrical shell of inner radius R2 = 75 cm, outer radius...
  17. A

    Two Parallel Conducting Plates with moving charge

    Homework Statement Two parallel conducting plates that are in deep space are brought to a potential difference of 3500 V, and a small pellet of mass 6.95 mg carrying a charge of 6.70 × 10-7 C accelerates from rest from the positive plate. With what speed will it reach the other plate...
  18. L

    How Do You Apply Gauss's Law to a Non-Uniformly Charged Non-Conducting Cylinder?

    [b]1. Homework Statement A long, solid, non-conducting cylinder of radius 8 cm has a non-uniform volume density, ρ, that is a function of the radial distance r from the axis of the cylinder. ρ = A*r2 where A is a constant of value 3 μC/m5. Homework Equations Gauss's law EA = Q/(epsilon)...
  19. W

    Conducting Sphere shielding an electric field

    Conducting Sphere "shielding" an electric field Hello. I have a question regarding a problem that I have seen printed many times in various books and which I saw on a test today: A hollow conducting sphere contains 2 charges, q_1\;and\;q_2 . Outside the sphere are two additional charges...
  20. T

    Conducting shell conceptual question

    Homework Statement A thick-walled, conducting spherical shell has charge q = +10 mC, inner radius R1 = 10cm, and outer radius R2 = 50 cm. A point charge Q = -20 mC is located at the center of the shell. Describe the the charge distribution in the shell. 2. Given answer +20 mC on...
  21. J

    Charge on inside of holey conducting shell

    Consider a charged spherical conducting shell. I understand that Gauss's law implies that there is no charge on the inside surface of the conducting shell. Now consider a charged spherical conducting shell with lots of holes cut uniformly all over it. Would Gauss's law still imply that...
  22. P

    Sources of Electric Field inside a conducting wire.

    Suppose that we have a wire that connects the two poles of a DC battery. The current produced indicates the presence of some Electric Field within the wire, having a constant magnitude and a direction that follows its path. Now the question is : What is the source of that Electric Field...
  23. J

    How to induce current on a static conducting material?

    Dear Physicists, I am currently thinking of a way of inducing a current in a conducting material by a magnetic field. I am not good at magnetism and electricity at all, but I think it should look like the picture below. By the way, the material in the middle does not move. Does anyone...
  24. A

    Electrostatic field inside a conducting shell

    Hi all Suppose we have a conducting shell (which is not necessarily a sphere) and no electric charge inside. Is the electrostatic field inside the conducting shell always zero? (even if there is some charges outside the shell) What if the shell is grounded? If the answer is yes, how it...
  25. M

    Charge in a spherical conducting shell

    Homework Statement There's a conducting spherical shell with Q = q2 and V =100v and outter radius R Homework Equations V=k*Q/R The Attempt at a Solution First I calculate the E field using Gauss law, and I get E=q2/4*Pi*E0*r Integrating the E field to get the potential V y...
  26. E

    A question about conducting loop

    Homework Statement A conducting loop (assumed to be infinitely thin) is being moved along time the x -axis as shownin figure 1the current in the wire is changing with i(t)=cos(wt) the loop position 2-tm t >0 http://img3.imageshack.us/img3/9530/adszbv.jpg Uploaded with ImageShack.uswhat...
  27. Y

    Question on a conducting ball in the middle of a constant electric field.

    I am referring to David Griffiths "Introduction to Electrodynamics" 3rd edition, page 141, example 3.8. The example is regarding to a conductive ball radius = R and contain no charge being put in the middle of a constant electric field \vec {E_0} = \hat z E_0. My problem with the example...
  28. C

    Two cocentric conducting spheres

    Homework Statement Two concentric conducting spheres of radii a and b (a < b) are separated into four hemispheres by a nonconducting sheet. The upper ( 0 < θ < π / 2 ) outer (radius b) and lower ( π / 2 < θ < π ) inner (radius a) hemispheres are kept at potential +V. The upper inner and lower...
  29. D

    Force between conducting spheres

    X and Y are two identical conducting spheres separated by a distance d. X has a charge of +6µC and Y has a charge of -2µC. The electric force between them is +F (i.e. attractive). The spheres are touched together and are then returned to their original separation d. What is the new value of the...
  30. R

    Empty conducting cube with 4 sides at ground and 2 sides at V

    Homework Statement Empty cubic box of dimension "a" with conducting walls. Two opposite walls are held at a constant potential V, while the other walls are grounded. Find an expression for the electric potential inside the box. (Assume box centered on the origin, walls are all normal to one...
  31. T

    Two line charges and a conducting cylinder are flying through space

    Homework Statement Griffiths 3.36: Two straight wires having equal and opposite line charges are situated on either side of a conducting cylinder (all the wires and the cylinder are "long", so we can ignore edge effects--this is undergraduate electrostatics, after all!). The cylinder has no...
  32. L

    A solid non conducting sphere

    Homework Statement A solid nonconducting sphere of radius R carries a nonuniform charge distribution, with a charge density ρ = ρsr/R, where ρs is a constant and r the distance from the centre of the sphere. Show that i) the total charge on the sphere is Q= πρsR3 and ii) the...
  33. L

    Electric field inside a conducting cylinder with wire

    Homework Statement You don't really need to read the top paragraph. A Geiger counter is used to detect ionizing radiation. The detector consists of a thin wire that is surrounded by a concentric circular conducting cylinder. A high voltage is applied to the wire so that it has a positive...
  34. S

    Hollow conducting sphere floating in oil

    Homework Statement A hollow sphere of gold floats in a large lake of oil of dielectric constant \kappa=3.3. The sphere is half immersed in the oil, and has a total charge of 2.2*10^-6 Coulombs. What fraction of this electric charge on the sphere is above the oil surface? Homework...
  35. D

    Stumped on Calculating Total Charge on Conducting Surface

    I'm trying to find the total charge on a conducting surface but am stuck at the last part of this integral. Maybe I'm just dumb but it looks really complex to me and I can't seem to figure it out. http://www.flickr.com/photos/54479402@N07/5045800952/#/photos/54479402@N07/5045800952/lightbox/...
  36. D

    Conducting spherical shell with point charge

    Hi, I received this question on my exam today and it stumped me... Conducting spherical shell of inner radius 0.045m and outer radius 0.18m, which has a net charge of zero. A charge Q of 5.5x10-5 is placed at the center, find the electric fields at point A (0.03m), point B (0.06m), and...
  37. M

    Help with gauss, Sheet vs conducting surface

    I'm having trouble using Guass' law to find electric fields. Where is the magnitude of the Electic field that you end up calculating? I had assumed it would be anywhere on the Gaussian surface, but it doesn't make sense now that I think of it. for instance, calculating the field of a charged...
  38. E

    Conducting liquid that is not electrolysed

    Hi, Can anyone suggest a conducting liquid that does not get electrolysed when current passes through it ? By liquid i mean anything, a salt solution, a liquid metal...The only restricting factor is that is should be in liquid state at room temperature(i.e does not require extra...
  39. J

    Concentric Cylindrical Conducting Shells Potential Difference

    Homework Statement An infiinitely long solid conducting cylindrical shell of radius a = 4.5 cm and negligible thickness is positioned with its symmetry axis along the z-axis as shown. The shell is charged, having a linear charge density λinner = -0.35 μC/m. Concentric with the shell is another...
  40. B

    Two conducting, charged spheres

    Homework Statement I have found this problem in Feynman Lectures on Physics vol. 2: Two equal conducting spheres, one with the total charge of +Q and the other with a total charge of -Q, are placed at some distance from each other. What is the force between them? Homework Equations...
  41. S

    Potential of Concentric Cylindrical Insulator and Conducting Shell

    Potential of Concentric Cylindrical Insulator and Conducting Shell...Please Help Homework Statement An infinitely long solid insulating cylinder of radius a = 3.6 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ =...
  42. D

    A Semi- Infinite Conducting Rod

    Homework Statement 25. A semi-infinite nonconducting rod (i.e. infinite in one direction only) has uniform positive linear charge density lambda. Show that the electric field at point P makes an angle of 45 degrees with the rod and that this...
  43. Z

    Charge inside a spherical conducting shell

    If a charge is placed inside a spherical conducting shell, is the total electric field inside it zero? I am thinking that if the charge is positive, then the conducting shell will have an equal amount of negative charge on its inner surface, therefore the E field should be zero inside, right?
  44. Y

    Charged particle between two conducting plates

    Homework Statement Two large conducting plates are separated by a distance 'L', and are connected together by a wire. A point charge 'q' is placed a distance 'x' from one of the plates. Show that the proportion of the charge induced on each plate is 'x/L' and '(L-x)/L'. (Hint: pretend the...
  45. S

    Magnetic field from conducting pipe

    Homework Statement A long, straight copper pipe of inner diameter 16mm and outer diameter 24mm carries a current of 100A. Calculate the magnetic flux density at distances i)5mm, ii)10mm and iii)15mm from its axis? Answer : i)0, ii)9*10^-4T iii) 13.3*10^-4T Homework Equations I...
  46. R

    Electric field outside of conducting sphere.

    Homework Statement A conducting sphere of radius 0.01 m has a charge of 1.0 × 10–9 C deposited on it. The magnitude of the electric field in N/C just outside the surface of the sphere is Homework Equations E=kq/r^2 EA=q/eo The Attempt at a Solution I tried the first equation...
  47. T

    Conducting rod through a magnetic field

    There is this conducting rod being moved to the right a constant speed v by a mechanical force F along 2 parallel , smooth, and horizontal conductors in a uniform vertical magnetic field of flux density B. The question is why is the speed constant although its being moved by a force ,F...
  48. F

    Conducting rail ciruit, against gravity

    Homework Statement So my textbook has a lot of example of conducting rails moving horizontally with unknown variables of F and B, but how would you approach a problem that has such a device pointed vertically with the moving bar droping? let's say R and B are known and we need to find...
  49. S

    Point charge in a conducting plane

    Point charge +Q is placed close to a very large conducting plane. A professor of physics asserted that the field caused by this configuration is the same as would be obtained by removing the plane and placing a point charge -Q of equal magnitude in the mirror-image position behind the initial...
  50. Y

    Potential of a conducting sphere with charge inside

    This is a general question: What is the electric potential of a hollow neutral conducting sphere with radius R with a charge q placed inside it? Intuitively I understand that it is the same - q/R, no matter where the charge is placed inside the sphere. Can anyone explain why it is so? My...
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