Question

the current of 4mA is flowing in circuit for 5 minutes, then the number of electrons following is

Answer 1

Explanation:

We know,

Current = Charge /time

Therefore,

4×10^3=Q/300 (5 min. = 300 seconds)

Thus, Q=1.2 Coulomb

Q=ne where e is elementary charge and is equal to 1.6×10^-19

Therefore

n=1.2/1.6×10^-19

Thus,

No. of electrons = 7.5 ×10^18