Under electrostatic equilibrium, the net electric field in the **interior** of a conductor is:
AEqual to $\sigma/\varepsilon_0$
BDirected along the surface
CZero
DEqual to the surface field
Answer & Solution
Correct answer: C. Zero
If E inside were non-zero, free electrons would accelerate — that contradicts equilibrium. Hence E_inside = 0; consequently the conductor's interior is at a single potential.
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