Q. The force between two magnetic poles is F. If the distance between the poles and pole strengths of each pole are doubled, then the force experienced is
A) 2F
B) $\frac{F}{2}$
C) $\frac{F}{4}$
D) F
Explanation
(d) $\ \ \ \ \ \ \ F = \frac{\mu_{0}}{4\pi}.\frac{m_{1}m_{2}}{r^{2}}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ldots(i)$
When pole strength of each pole become double.
$\therefore\ F^{'} = \frac{\mu_{0}}{4\pi}.\frac{\left( 2m_{1} \right)\left( 2m_{2} \right)}{(2r)^{2}} = F$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.