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$A body has a charge of - 4 μC then how many excess electrons the body has ?$

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$1.25 \times 10^{13}$

$2.5 \times 10^{13}$

$2.5 \times 10^{28}$

$4 \times 10^{25}$

answer is B.

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Detailed Solution

$\begin{array}{l} T h e charge on a body is due to e x c e s s e l e c t r o n s o n t h e b o d y \\ - 4 μ C = - n \times 1.6 \times 10^{- 19} \\ n = 2.5 \times 10^{13} \end{array}$

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