Homework Statement
Distance between plates of a parallel-plate vacuum capacitor is d. The capacitor is attached to a battery that keeps it at a voltage V. The space between plates is now filled dielectric relative permittivity epsilon. How will charge density of the plates change?
Homework...
Homework Statement
Charged sphere with a mass of 15 mg and charge 2 nC moves with a speed of 15 cm/s towards a fixed point charge of 3 nC. How close will sphere approach charge?
Homework Equations
K=(1/2)*mv2
U=k*(Q1Q2/r)
The Attempt at a Solution
So I am not sure I approached correctly but...
Homework Statement
Two parallel very long threads are uniformly charged with linear charge density of 10-8 C/cm . Distance between them is 15 cm. Find electric field vector at a distance of 15 cm from both threads.
Homework Equations
E*dA=Qenclosed/permittivity of free space
The Attempt at a...
Thanks for reply, so to reformulate:
Area of sphere = 4pir2 =>4*3.14*0.152
Total charge Q would equal to(?) = 0.12C/m2*Area of Sphere
Then if sphere centre can be considered as a point charge(?) the Rfinal would be radius of sphere+distance to charge?
Homework Statement
How much work should be done on a point charge of q=15 nC to bring it from infinity to a distance of 3 cm from a surface of a charged sphere? Diameter of sphere is 15 cm, its surface charge density is 12 microC/cm2
Homework Equations
W=deltaU=q*deltaV
v=kQ/r...
Homework Statement
Charges q1= +3 nC and q2=+8 nC have a separation distance of d= 12 cm. Find the point where the electric field is zero.
Homework Equations
E=kq/r2
The Attempt at a Solution
I approached this problem as follows:
1) I assume the point where it happens is between charges, on...