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Question

# A conductor carries a current of 0.2 A. How many electrons will flow in 30 seconds if the charge on one electron is 1.6×10−19 C.

A

3×1019

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B

3.75×1019

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C

2.75×1019

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D

2×1019

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Solution

## The correct option is B 3.75×1019 It is given that current I=0.2 A, time t=30 s and charge on one electron is e=1.6×10−19 C. Let the number of electrons be n. We know I=Qt and Q=n×e where e is the charge on one electron. So, I=n×et On substituting the values, 0.2=n×1.6×10−1930 ⇒ n=3.75×1019 Therefore, 3.75×1019 electrons will flow in 30 seconds.

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