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A charge q is placed at the some distanc...

A charge `q` is placed at the some distance along the axis of a uniformly charged disc of surface cahrge density `sigma`. The flux due to the charge `q` through the disc is `phi`. The electric force on charge `q` exerted by the disc is

A

`sigmaphi`

B

`(sigmaphi)/(4pi)`

C

`(sigmaphi)/(2pi)`

D

`(sigmaphi)/(3pi)`

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The correct Answer is:
a
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