What is Magnetic force: Definition and 413 Discussions

In physics (specifically in electromagnetism) the Lorentz force (or electromagnetic force) is the combination of electric and magnetic force on a point charge due to electromagnetic fields. A particle of charge q moving with a velocity v in an electric field E and a magnetic field B experiences a force of





F

=
q


E

+
q


v

×

B



{\displaystyle \mathbf {F} =q\,\mathbf {E} +q\,\mathbf {v} \times \mathbf {B} }
(in SI units). It says that the electromagnetic force on a charge q is a combination of a force in the direction of the electric field E proportional to the magnitude of the field and the quantity of charge, and a force at right angles to the magnetic field B and the velocity v of the charge, proportional to the magnitude of the field, the charge, and the velocity. Variations on this basic formula describe the magnetic force on a current-carrying wire (sometimes called Laplace force), the electromotive force in a wire loop moving through a magnetic field (an aspect of Faraday's law of induction), and the force on a moving charged particle.
Historians suggest that the law is implicit in a paper by James Clerk Maxwell, published in 1865. Hendrik Lorentz arrived at a complete derivation in 1895, identifying the contribution of the electric force a few years after Oliver Heaviside correctly identified the contribution of the magnetic force.

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  1. A

    How Does Current Direction Affect Magnetic Force on a Conductor?

    magnetic forces on a conductor A straight, vertical wire carries a current of 1.13A downward in a region between the poles of a large superconducting electromagnet, where the magnetic field has a magnitude of 0.553T and is horizontal. What is the magnitude of the magnetic force on a section...
  2. K

    Help Solve Kristi's Physics Problem: Particle Deflection & Magnetic Force

    ok here's my problem(s)... I think the first one I'm missing something... it says: A particle initially moving south in a vertically downward magnetic field is deflected toward the east. What is the sign of the charge on the particle? Explain your answer with a diagram. So the way I...
  3. H

    Need help for a prove about magnetic field and magnetic force

    here is the problem: prove that the vector of the magnetic force cannot be parallel to the plane that contains the vector of the particle's velocity and magnetic field. someone please help me to solve this, thanks so much for your time.
  4. R

    Magnetic Force on a Particle at Zero Velocity

    ok I'm stuck here... At a particular point in time, an electron is moving with a velocity of v=(2.0*10^6 m/s)i + (3.0*10^6 m/s)j in a constant magnetic field with strength e=(0.030T)i - (0.15T)j What is the magnitude of the magnetic force on the electron at that moment? this i found...
  5. K

    Magnetic force between 3 straight wires

    Find I2 so that the magnetic force per unit length on each wire is zero. The three parallel wires are equally spaced. Current directions are shown with '<' or '>'. I1 = I3 = 1 A < I1 < I1 < I1 --------------- > I2 > I2 > I2 --------------- < I3 < I3 < I3 --------------- I have...
  6. K

    Magnetism and Magnetic Force Studies

    Magnetism and magnetic force are typically explained by the resultant effect on moving charges. Is anyone aware of any reseach, studies or literature that quantifies the interactive forces between two or more magnetic objects without utilizing the effect on moving charges to explain interactive...
  7. A

    Calculating Magnetic Force of Fe+ ion at a Given Point

    A Fe+ ion is traveling at 200 m/sec in a direction 20 deg south of west at a point. The magnetic field at that point is 0.4 T directed at 10 deg west of south. What is the instantaneous magnetic force that acts on the Fe is how many Newtons?
  8. B

    Magnetic Force: Work or No Work?

    it is often said that "magnetic forces can do no work".. but a straight wire segment placed in a magnetic field experiences a force of mag. B*I*L (LaPlace' law) which accelerates it and thus does work.. how can this be true?? is it really an electric force that is doing the work here or what?
  9. A

    Magnetic Force on segment of wire

    A segment of wire carries a current of 30 A along the x-axis from x=-6m to x=0 and then along the z axis from z=0 to z=5.5m. In this region of space, the magnetic field is equal to 14mT in the positive z direction. What is the magnitude F of the force on the segment of wire? Answer in units of...
  10. E

    How Does Current Direction Affect Magnetic Force Between Parallel Wires?

    Three parallel wires each carry current I in the direction shown in the figure (file attached). If the separation between adjacent wires is d, calculate the magnitude and direction of the net magnetic force per unit length on each wire. a) What is the magnetic force on the top wire? I think...
  11. E

    How Do Magnetic Forces Affect Parallel Current-Carrying Wires?

    Three parallel wires each carry current I in the direction shown in the figure (file attached). If the separation between adjacent wires is d, calculate the magnitude and direction of the net magnetic force per unit length on each wire. a) What is the magnetic force on the top wire? I think...
  12. D

    How Do You Calculate the Magnetic Force on a Parabolic Wire in 3D?

    I'm stuck on this problem. I think it's the 3D geometry that's giving me the biggest problem. The current i exists in the direction shown (from left to right) in a parabolic wire segment whose equation is y = (x^2)/b in the XY plane between x = -a and x = +a. Magnetic flux density, given by...
  13. Rockazella

    Magnetic Field vs Magnetic Force

    I got sucked into the page on a website about magnets. It got into stuff about magnetic force on a moving charge. It said that the force on the charge is perpendicular to the magnetic field and the velocity of the charge. I got very confused because it called this force the "magnetic force" and...
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