Physics · 2021
JEE Main · 27 August 2021, Shift 1 · Q11
A uniformly charged disc of radius R having surface charge density σ is placed in the x y plane with its center at the origin. Find the electric…
A uniformly charged disc of radius $\displaystyle R$ having surface charge density $\displaystyle \sigma$ is placed in the $\displaystyle x y$ plane with its center at the origin. Find the electric field intensity along the $\displaystyle z$-axis at a distance Z from origin :
Official answer
(2)
$\displaystyle E=\frac{\sigma}{2 \varepsilon_0}\left(1-\frac{Z}{\left(Z^2+R^2\right)^{1 / 2}}\right)$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.