Q.

If the flux of the electric field is zero.

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a

The electric field must be zero everywhere on the surface.

b

The electric field may be zero everywhere on the surface.

c

The charge inside the surface must be zero.

d

The charge in the vicinity of the surface must be zero.

answer is B, C.

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Detailed Solution

ϕ=EAcosθ=qinε0, and so electric field may be either zero at each point of the surface or θ=90°. Also if qin=0ϕ must be zero.

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If the flux of the electric field is zero.