Question

An electron is moving in a circle of radius $5.1\times {10}^{-11}m$ at a frequency of $6.8\times {10}^{15}$ revolution/second. The equivalent current is approximately.

• A. $5.1\times {10}^{-3}A$
• B. $6.8\times {10}^{-3}A$
• C. $1.1\times {10}^{-3}A$
• D. $2.2\times {10}^{-3}A$

Answer 1

The correct option is C $1.1\times {10}^{-3}A$

Given,

$r=5.1\times {10}^{-11}m$

$e=1.6\times {10}^{-19}C$

$f=\frac{1}{T}=6.8\times {10}^{15}rad/sec$

The equivalent current is approximately

$i=\frac{e}{T}$

$i=ef=1.6\times {10}^{-19}\times 6.8\times {10}^{15}$

$i=1.1\times {10}^{-3}A$

The correct option is C.