Q. Electron of mass m and charge e in external field E experiences acceleration
A) $\frac{e}{mE}$, in the opposite direction to the field
B) $\frac{eE}{m},$ in the direction of the field
C) $\frac{em}{E},$ in the direction of the field
D) $\frac{eE}{m},$in the opposite direction of the field
Explanation
(a) $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ F = qE$
or$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ma = eE$
$\Rightarrow \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ a = \frac{qE}{m}$
or$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ a = \frac{eE}{m}$ in the opposite direction of the field.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.