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?62.5×10196.25×10196.05×101960.5×1019

Solution

## The correct option is B 6.25×1019Given, 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=1.6×10−19 C Number of electrons, n=Qe n=10 C1.6×10−19 C n=6.25×1019

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