Question

What is the $e/m$ value of electron ?

• A. $1.6\times {10}^{11}C/kg$
• B. $1.6\times {10}^{-19}C/kg$
• C. $1.759\times {10}^{11}C/kg$
• D. $901\times {10}^{-31}C/kg$

Answer 1

Answer: (C)

$1.759\times {10}^{11}C/kg$

$\frac{e}{m}$ value of electron $=\frac{1.6\times {10}^{-19}}{9.1\times {10}^{-31}}$ ($\because$ charge of electron $=1.6\times {10}^{-19}C$, Mass of electron $=9.1\times {10}^{-31}kg$)

$=0.1759\times {10}^{12}\frac{c}{kg}$

$=1.759\times {10}^{11}\frac{c}{kg}$