A thin metallic wire having cross sectional area of 10^-4 m^2 is used to make a ring of radius 30 cm. A positive charge of 2 π C is uniformly…

A thin metallic wire having cross sectional area of $\displaystyle 10^{-4} \mathrm{~m}^2$ is used to make a ring of radius $\displaystyle 30$ cm . A positive charge of $\displaystyle 2 \pi C$ is uniformly distributed over the ring, while another positive charge of $\displaystyle 30$ pC is kept at the centre of the ring. The tension in the ring is $\displaystyle \_\_\_\_$ N; provided that the ring does not get deformed (neglect the influence of gravity). $$\left(\text { given, } \frac{1}{4 \pi \epsilon_0}=9 \times 10^9 \text { SI units }\right) $$