Q. A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance $'r'$. The speed of the particle is
A) Proportional to $r^{2}$
B) Independent of $r$
C) Proportional to $r$
D) Proportional to $1/r$
Explanation
(b) $\frac{mv^{2}}{r} \propto \frac{K}{r} \Rightarrow v \propto r^{o}$
$i.e.$ speed of the particle is independent of $r$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.