Q.

Figure shows a closed surface which intersects a conducting sphere. If a positive charge is placed at the point P, the flux of the electric field through the closed surface

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a

will remain zero

b

will become positive

c

will become negative

d

will become undefined

answer is B.

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Detailed Solution

The positive & negative charges developed on different parts of conducting sphere due to induction. Hence the flux through the closed surface is positive.
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Figure shows a closed surface which intersects a conducting sphere. If a positive charge is placed at the point P, the flux of the electric field through the closed surface