A ring has charge \( \mathrm{Q} \) and radius \( \mathrm{R} \). If \( \mathrm{a} \) charge \( \m...

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A ring has charge \( \mathrm{Q} \) and radius \( \mathrm{R} \). If \( \mathrm{a} \) charge \( \mathrm{q} \) is placed at its centre then the increase in tension in the ring is
a. \( \frac{\mathrm{Qq}}{4 \pi \varepsilon_{0} \mathrm{R}^{2}} \)
b. Zero
c. \( \frac{\mathrm{Qq}}{4 \pi^{2} \varepsilon_{0} \mathrm{R}^{2}} \)
d. \( \frac{\mathrm{Qq}}{8 \pi^{2} \varepsilon_{0} \mathrm{R}^{2}} \)
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