A uniformly charged disc of radius R having surface charge density σ is placed in the x y plane with…

1. $E=\frac{2{\epsilon }_0}{\sigma }\left(\frac{1}{{\left(Z^2+R^2\right)}^{1/2}}+Z\right)$
2. $E=\frac{\sigma }{2{\epsilon }_0}\left(1+\frac{Z}{{\left(Z^2+R^2\right)}^{1/2}}\right)$
3. $E=\frac{\sigma }{2{\epsilon }_0}\left(1-\frac{Z}{{\left(Z^2+R^2\right)}^{1/2}}\right)$
4. $E=\frac{\sigma }{2{\epsilon }_0}\left(\frac{1}{\left(Z^2+R^2\right)}+\frac{1}{Z^2}\right)$

Solution

Asked in: JEE Main 2021 (27 Aug Shift 1)

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