Question

How many electrons pass through a lamp is $5$ minutes, if the current through it is $0.1A$?

• A. $18.75\times {10}^{18}$
• B. $18.75\times {10}^{17}$
• C. $18.75\times {10}^{19}$
• D. $18.75\times {10}^{20}$

Answer 1

The correct option is C $18.75\times {10}^{19}$

We know that-

$t=5min=5\times 60=300s$

$q=It=0.1\times 300=30C$

Now, $q=Ne$ where $N=$ number of electrons

$⟹N=\frac{q}{e}=\frac{30}{1.6\times {10}^{-19}}$

$⟹N=18.75\times {10}^{19}$

Answer-(C)