Physics · 2021
JEE Main · 26 August 2021, Shift 2 · Q20
The two thin coaxial rings, each of radius ' a ' and having charges +Q and -Q respectively are separated by a distance of ' s '. The potential…
The two thin coaxial rings, each of radius ' a ' and having charges +Q and -Q respectively are separated by a distance of ' $\displaystyle s$ '. The potential difference between the centres of the two rings is :
Official answer
(4)
$\displaystyle \frac{\mathrm{Q}}{2 \pi \varepsilon_0}\left[\frac{1}{\mathrm{a}}-\frac{1}{\sqrt{\mathrm{~s}^2+\mathrm{a}^2}}\right]$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.