A charge \( q \) is placed at some distance along the axis of a uniformby charged dise of surfac...
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0A charge \( q \) is placed at some distance along the axis of a uniformby charged dise of surface eharge density \( \sigma \). The flux due to the charge \( q \) through the dise is \( \phi \). Whe electric force on charge \( q \) exerted by the disc is:
(A) \( \sigma \phi \)
(B) \( \frac{\sigma \phi}{4 \pi} \)
(C) \( \frac{\sigma \omega}{2 \pi} \)
(D) \( \frac{\Phi \phi}{3 \pi} \)
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