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Question

Physics Question on Electric Current

The number of electron in 22 coulomb of charge is

A

5×10295\times10^{29}

B

12.5×101812.5\times10^{18}

C

6×10196\times10^{19}

D

9×10119\times10^{11}

Answer

12.5×101812.5\times10^{18}

Explanation

Solution

Charge q=neq=n e
∴n=qe=21.6×10−19\therefore n=\frac{q}{e}=\frac{2}{1.6 \times 10^{-19}}
=12.5×1018=12.5 \times 10^{18}