A ring has charge \( Q \) and radius \( R \). If a charge \( q \) is placed at its centre then t...

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A ring has charge \( Q \) and radius \( R \). If a charge \( q \) is placed at its centre then the increase in tension in the ring is
\( \mathrm{P} \)
(A) \( \frac{Q q}{4 \pi \varepsilon_{0} R^{2}} \)
(B) zero
W
(C) \( \frac{Q q}{4 \pi^{2} \varepsilon_{0} R^{2}} \)
(D) \( \frac{Q q}{8 \pi^{2} \varepsilon_{0} R^{2}} \)
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