Q. Two equal negative charge –q are fixed points (0, a) and (0,-0) on the Y-axis. A positive charge Q is released from rest at point (2a, 0) on the X-axis. The charge Q will
A) execute SHM about origin
B) move to infinity
C) Move to the origin and remained at rest
D) execute oscillatory but not SHM
Explanation
(d) Here the restoring force of charge $Q$ is inversely proportional to the square of the distance, hence the motion will be oscillatory but not SHM, for which restoring force $\propto$ displacement
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.