Electricity and Magnetism Answers

1.The right end of a rod with length L and total charge Q is at a distance L to the surface of a 

spherical object with diameter L and total charge Q also, as shown in the figure. The axis of 

the rod and the center of the spherical object are collinear. Determine the magnitude of the force exerted by the two objects on each other, and whether 

the force is attractive or repulsive for the following cases:

A. Both the rod and the sphere are insulators, the charge Q is uniformly distributed on 

the rod and the surface of the sphere.

B. The rod is an insulator while the sphere is a conductor. The charge Q is uniformly 

distributed on the rod.(Use method of images)

What is electric field.

. The potential field 𝑉 = 2𝑥

2𝑦𝑧 − 𝑦

3

𝑧 exists in a dielectric medium having 𝜀 = 2𝜀0 (a) Does V satisfy

Laplace`s equation? (b) calculate the total charge within the unit cube 0 < 𝑥, 𝑦, 𝑧 < 1𝑚.

what are magnitude and direction of electric field that will just support an electron so that it long in air

What will happen if a balanced tray each side having 9 balls one of the sides one ball is removed?

A point charge of 1x 10^-6C is at centre of Gaussian surface with cubical shape 1m on edge. Find flux through surface?

Question Link: https://ibb.co/xzWC2Ly

Polarization of a wave is

A. direction of electric field

B. direction of magnetic field at some fixed point in space

C. either (a) or (b)

D. none of the above

A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?

A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is