Question

The specific charge of an electron is

• A. $ 1.6\times 10^{-19}C $
• B. $ 4.8\times 10^{-19}$ stat $-C$
• C. $ 1.76\times 10^{-11}C/kg $
• D. $ 1.76\times 10^{11}C/kg $

Answer 1

Answer: (D)

The ratio of charge $[e]$ to mass $[m]$ is defined as specific charge.
$\therefore $ Specific charge $=\frac{e}{m}$
For electron $e=1.6 \times 10^{-19} C,$
$m=9 \times 10^{-31} kg$
$\therefore $ Specific charge $=\frac{1.6 \times 10^{-19}}{9 \times 10^{-31}}$
$=1.76 \times 10^{11} C / kg$