Question

Give the number of electrons passing through a wire per minute. The current flowing through it is 500mA.

(a) 1.875 × 10^20

(b) 6.875 × 10^20

(c) 1.875 × 10^-20

(d) 6.875 × 10^-20

The question was asked in quiz.

My question comes from Electric Current in chapter Current Electricity of Physics – Class 12

Answer 1

Correct choice is (a) 1.875 × 10^20

For explanation I would say: Number of electrons, n = \(\frac {It}{e}\).

= \(\frac {(500 \times 10^{-3} \times 60)}{(1.6 \times 10^{-19})}\)

= 1.875 × 10^20.