ElectrostaticsHard
Question
Figure shows a charge Q placed at the centre of open face of a cylinder as shown in figure. A second charge q is placed at one of the positions A, B, C and D, out of which positions A and D are lying on a straight line parallel to open face of cylinder. In which position(s) of this second charge, the flux of the electric field through the cylinder remains unchanged ?
Options
A.A
B.B
C.C
D.D
Solution
If charge is at A or D, its all field lines cut the given surface twice which means that net flux due to this charge remains zero and flux through given surface remains unchanged.
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