Question

(multiple choice)

There must be zero electric field

a) in a region with no charges.

b) in a region with a constant magnetic field.

c) in an ideal conductor.

d) all of the above

Answer 1

(a) the static charge is responsible for the electric field lines and hence electric field intensity. So if there is ni charge, the electric field will be zero.

(b) according to Faraday law a varying magnetic field induces an EMF. So dor a constant magnetic field region, no EMF will be induced hence there will be zero electric field.

(c) in an ideal conductor all the charge will go on the surface of the conductor so there will be a zero electric field inside the conductor.

Thus the answer is

(d) all of the above