Physics · 2013
JEE Main · 23 April 2013, Shift 1 · Q30
A liquid drop having 6 excess electrons is kept stationary under a uniform electric field of 25.5 kV m^-1. The density of liquid is 1.26 × 10^3 kg…
A liquid drop having $\displaystyle 6$ excess electrons is kept stationary under a uniform electric field of $\displaystyle 25.5 \mathrm{kV} \mathrm{m}^{-1}$. The density of liquid is $\displaystyle 1.26 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$. The radius of the drop is (neglect buoyancy).
Official answer
(2)
$\displaystyle 7.8 \times 10^{-7} \mathrm{~m}$
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.