A body has a charge of $$-3$$μC. If it has $$2.5$$×$$1013$$ protons, then how many electrons the body has?

The charge on a body is due to excess electrons on the body−$$4$$μ$$C=$$−n×$$1.6$$×$$10$$−$$34$$ $$n=2.5$$×$$1028Total$$ number of electrons $$=2.5$$×$$1028+2.5$$×$$1013$$

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Question

$A body has a charge of -3 μC . If it has 2.5 \times 10^{13} protons, then how many electrons the body has ?$

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Solution

$\begin{array}{l} T h e charge on a body is due to e x c e s s e l e c t r o n s o n t h e b o d y \\ - 4 μ C = - n \times 1.6 \times 10^{- 34} \\ n = 2.5 \times 10^{28} \\ T o t a l n u m b e r o f e l e c t r o n s = 2.5 \times 10^{28} + 2.5 \times 10^{13} \end{array}$

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