The two thin coaxial rings, each of radius a and having charges + Q and - Q respectively are separated by a…

1. $\frac{Q}{2\pi {\epsilon }_0}\left[\frac{1}{a}-\frac{1}{\sqrt{s^2+a^2}}\right]$
2. $\frac{Q}{4\pi {\epsilon }_0}\left[\frac{1}{a}-\frac{1}{\sqrt{s^2+a^2}}\right]$
3. $\frac{Q}{4\pi {\epsilon }_0}\left[\frac{1}{a}+\frac{1}{\sqrt{s^2+a^2}}\right]$
4. $\frac{Q}{2\pi {\epsilon }_0}\left[\frac{1}{a}+\frac{1}{\sqrt{s^2+a^2}}\right]$

Solution

Asked in: JEE Main 2021 (26 Aug Shift 2)

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