A) \[{{10}^{42}}\]
B) 10
C) 1
D) \[{{10}^{-43}}\]
Correct Answer: D
Solution :
Gravitational force between electrons \[{{F}_{G}}=\frac{G{{({{m}_{e}})}^{2}}}{{{r}^{2}}}\] Electrostatics force between electrons \[{{F}_{e}}=k.\frac{{{e}^{2}}}{{{r}^{2}}}\] \[\frac{{{F}_{G}}}{{{F}_{e}}}=\frac{G{{({{m}_{e}})}^{2}}}{k.{{e}^{2}}}=\frac{6.67\times {{10}^{-11}}\times {{(9.1\times {{10}^{-31}})}^{2}}}{9\times {{10}^{9}}\times {{(1.6\times {{10}^{-19}})}^{2}}}\]\[=2.39\times {{10}^{-43}}\]
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