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Two identical spheres carrying charges $- 9 μ C$ and $5 μ C$ respectively are kept in contact and then separated from each other. Point out true statement from the following. In each sphere

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$1.25 \times 10^{13}$ electrons are in excess

$2.15 \times 10^{13}$ electrons are in deficit

$2.15 \times 10^{13}$ electrons are in excess

$1.25 \times 10^{13}$ electrons are in deficit

answer is B.

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Detailed Solution

After initial contact and separation, each sphere will have charge,

$q = \frac{- 9 μ C + 5 μ C}{2} = - 2 μ C$

$q = n e$

$n = \frac{q}{e} = \frac{2 \times 10^{- 6}}{1.6 \times 10^{- 19}} = 1.25 \times 10^{13}$

$Thus, 1.25 \times 10^{13} electrons in excess.$

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