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Q.Fig. shows a charged q placed at the centre of a hemisphere.A second charge Q is placed at one of the positions A,B,C and D.In which position(s) of the second charged,the flux of the electric field through the hemisphere remains unchanged? (a)A (b)B (c)C (d)D Please explain the result.
a & c are correct. reason-on flux there is no effect when from a closed surface incoming lines of forces have way to go out i.e outgoing lines of forces are present . In fig. when we draw lines of force from a & c they will intersect the curve at two points i.e. incoming & outgoing lines of forces are present i.e. no effect on flux ultimately. while when we draw line from b & d they will intersect curve at one point i.e. incoming lines of forces are present but outgoing lines of forces are absent means tht affects flux.
Please explain in more detail. If possible pictorially
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