Question

If ${10}^{20}$ electrons flows 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,
q = ${10}^{20}$
t = 8 s

We know that,
$q=ne$
where,
q = total charge
n = 0 , 1 , 2........ (All positive or negative integers)
e = charge on one electron

So,
q = ${10}^{20}\times 1.6\times {10}^{-19}=16C$

Also, we have

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

$I=\frac{q}{t}=\frac{16}{8}=2A$