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  • A current if flows through a wire. Calculate the number of electrons passing through any cross-section of the wire in <img

A current if IA flows through a wire. Calculate the number of electrons passing through any cross-section of the wire in 8 seconds.

Option: 1

5 \times 10^{18} \text { electrons }


Option: 2

4 \times 10^{18} \text { electrons }


Option: 3

5 \times 10^{19} \text { electrons }


Option: 4

5 \times 10^{20} \text { electrons }


Answers (1)

best_answer

If N is the number of electrons possing through any cross-section of the wire and e is the charge of an elctrons, then

q=N e \text { and } I=\frac{q}{t}=\frac{N e}{t}

So, \begin{aligned} N=\frac{I t}{e} & =\frac{1 \times 8}{1.6 \times 10^{-19}} \\ & =5 \times 10^{19} \text { electrons } \end{aligned}

Posted by

sudhir.kumar

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