Question

If ${10}^{20}$ electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.

• A. 2 A
• B. 0.2 A
• C. 8 A
• D. 1 A

Answer 1

The correct option is A

2 A

Given, number of electrons, $n={10}^{20}$; time,t=8 s

We know that, $q=ne$, where q = Total charge, n = number of electrons, e = charge of an electron

Also, $I=\frac{q}{t}$

Hence, $I=\frac{ne}{t}=\frac{{10}^{20}\times 1.6\times {10}^{-19}}{8}=2A$