Question

In a region of constant potential ______.

1. the electric field is uniform
2. the electric field is zero
3. there can be no charge inside the region
4. the electric field shall necessarily change if a charge is placed outside the region

Options

• b and c

• a and c

• b and d

• c and d

Answer 1

b and c

Explanation:

We know, the electric field intensity E and electric potential V are dV related as E = – dV/dr

or we can write |E| = ΔV/Δr

The electric field intensity E and electric potential V are related as E = 0 and for V = constant, dV/dr = 0 this imply that electric field intensity E = 0.

If some charge is present inside the region then electric field cannot be zero at that region, for this V = constant is not valid.