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Q.

If a charge q is placed at the center of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be :

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a

qε0

b

q2ε0

c

q2πε0

d

q4ε0

answer is B.

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Detailed Solution

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Total flux through complete spherical surface is qε0

so, flux through curved surface = flux passing through flat surface = q2ε0. 

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If a charge q is placed at the center of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be :