Question

An electron at rest has a charge of $1.6\times {10}^{-19}\text{C}$. It starts moving with a velocity $v=c/2$, where $c$ is the speed of light, then the new charge on it is -

• A. $1.6\times {10}^{-19}\text{C}$
• B. $1.6\times {10}^{-19}\sqrt{1-{\left(\frac{1}{2}\right)}^2}\text{C}$
• C. $1.6\times {10}^{-19}\sqrt{{\left(\frac{1}{2}\right)}^2-1}\text{C}$
• D. $\frac{1.6\times {10}^{-19}}{\sqrt{1-{\left(\frac{1}{2}\right)}^2}}\text{C}$

Answer 1

The correct option is A $1.6\times {10}^{-19}\text{C}$

Charge is independent of speed. So, the speed of the electron can not affect the charge of the electron.