Question

Q.7. Calculate the potential difference between two plates when they are separated by a distance of a 0.005m and are able to hold an electron motionless between them. (Mass of electron = 9.1x10-³1

Answer 1

$mg=eE$

$E=U/d$

where $m$ is mass of electron,

$e$ is charge of electron,

$E$ is electric field,

$U$ is potential difference between two plates,

$d$ is distance between two plates.

Then:

$U=\frac{mgd}{e}=\frac{9.1\cdot10^{-31}\cdot9.8\cdot0.005}{1.6\cdot^{-19}}=2.787\cdot10^{-13}\ V$