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Question

A wire of uniform area of cross-section carries a current of 0.5 A. How many electrons would pass through this cross-section in 20 seconds?
  1. 62.5×1019
  2. 6.25×1019
  3. 6.05×1019
  4. 60.5×1019


Solution

The correct option is B 6.25×1019
Given,
Electric Current, I=0.5 A
Time, t=20 s

Let Q be the amount of charge flowing through the cross section.
Electric current is defined as:
I=Qt
Q=It
Q=0.5 A ×20 s=10 C

Charge of an electron, e=1.6×1019 C
Number of electrons,
n=Qe
n=10 C1.6×1019 C
n=6.25×1019

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