Question

$4\times {10}^9$ electrons flow through an area in 2 micro seconds, find current passing through that area

• A. 0.32 mA
• B. 3.2 mA
• C. 8 mA
• D. 8 mA

Answer 1

The correct option is A 0.32 mA

$i=\frac{\Delta q}{\Delta t}=\frac{ne}{\Delta t}=\frac{4\times {10}^9\times 1.6\times {10}^{-19}}{2\times {10}^{-6}}$
$=3.2\times {10}^{-4}$ A
=0.32 mA