Electricity and Magnetism Answers

Two charges are found to be 0.25 m apart. The charge of the first is thrice the charge of the second. If the magnitude of the second charge is 2 uC, find the force experienced by the first charge due to the second charge.

Two charges are found to be 0.20 m apart. The charge of the first is twice the charge of the second. If the magnitude of the second charge is 1 nC, find the force experienced by the first charge due to the second charge.

The potential at the surface of a sphere (radius R) is given by

V_{0}=k \cos 6 \theta

V0

​=kcos6θ ,

where k is a constant. Find the potential inside and outside the sphere, as well as the surface charge density σ (θ) on the sphere. (Assume there’s no charge inside or outside the sphere.)

1.   Three point charged particles are arranged in a line as shown in the figure below. Charge A = -5 µC, charge B = +10 µC, and charge C = -12 µC. Calculate the net electrostatic force on particle B due to the other two charges.

If two electrons are 1.50 x 10^-10 m each from a proton, find the magnitude and direction of the net electric force they will exert on the proton.

Two small spheres spaced apart have equal charge. How many electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 N?

Two equal positive charges q1 = q2 = 4.0 μC are located at x = 0, y = 0.30 m, x = 0, y = -0.30 m and respectively. What are the magnitude and direction of the total electric force that q1 and q2 exert on a third charge at Q = 4.0 μC x = 0.40 m, y = 0?

Two point charges are located on the -axis of a coordinate system: q1 = 1.0 nC is at x = +2.0 cm, and q2 is at x = +4.0 cm. What is the total electric force exerted by q1 and q2 on a charge q3 = 5.0 nC at x = 0?

Lightning occurs when there is a flow of electric charge (principally electrons) between the

ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s this lasts for 100 μs or less. How much charge flows between the ground and the cloud in this time? How many electrons flow during this time?

A small charge (q= 6.0 mC) is found in a uniform E-field (E= 2.9 N/C). determine the force on the charge.