Question

Strength of the electric field in which an electron will experience a force equal to its weight is $(g=10m/s^2)$ :

• A. $5.69\times {10}^{-11}N/C$
• B. $2\times {10}^{-12}N/C$
• C. $4\times {10}^{-12}N/C$
• D. $4\times {10}^{-11}N/C$

Answer 1

Answer: (A)

$5.69\times {10}^{-11}N/C$

As $qE=mg$
$E=\frac{(9.1\times {10}^{-31})\times 10}{(1.6\times {10}^{-19})}$

$E=5.69\times {10}^{-11}N/C$