Physics · 2020
JEE Main · 8 January 2020, Shift 2 · Q10
Consider two charged metallic spheres S_1 and S_2 of radii R_1 and R_2, respectively. The electric fields E_1 (on S_1 ) and E_2 (on S_2 ) on their…
Consider two charged metallic spheres $\displaystyle \mathrm{S}_1$ and $\displaystyle \mathrm{S}_2$ of radii $\displaystyle \mathrm{R}_1$ and $\displaystyle \mathrm{R}_2$, respectively. The electric fields $\displaystyle \mathrm{E}_1$ (on $\displaystyle \mathrm{S}_1$ ) and $\displaystyle \mathrm{E}_2$ (on $\displaystyle \mathrm{S}_2$ ) on their surfaces are such that $\displaystyle \mathrm{E}_1 / \mathrm{E}_2=\mathrm{R}_1 / \mathrm{R}_2$. Then the ratio $\displaystyle \mathrm{V}_1$ (on $\displaystyle \mathrm{S}_1$ )/ $\displaystyle \mathrm{V}_2$ (on $\displaystyle \mathrm{S}_2$ ) of the electrostatic potentials on each sphere is :
Official answer
(2)
$\displaystyle \left(R_1 / R_2\right)^2$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.