Question

The force experienced by a moving electron which is entering into a condenser perpendicular to the direction of electric field having its plates 0.1m apart and potential difference of 300 V is

• A. $3.2\times {10}^{-16}N$
• B. $1.6\times {10}^{-15}N$
• C. $0.8\times {10}^{-17}N$
• D. $4.8\times {10}^{-16}N$

Answer 1

The correct option is D $4.8\times {10}^{-16}N$

Electric field in the condenser
$\Rightarrow E=\frac{300}{0.1}V/m=3\times {10}^{3}V/m$
So,
Force experienced by electron $=qE$
$=1.6\times {10}^{-19}\times 3\times {10}^{3}N$
$=4.8\times {10}^{-16}N$

So, the answer is option (D).