Q. Under the influence of the Coulomb field of charge $+ Q,$ a charge $- q$ is moving around it in an elliptical orbit. Fine out the correct statement(s)
A) The angular momentum of the charge $- q$ is constant
B) The linear momentum of the charge $- q\ $is constant
C) The angular velocity of the charge $- q\ $is constant
D) The linear speed of the charge $- q\ $is constant
Explanation
(a) Torque about $Q$ of charge $- q$ is zero, so angular momentum charge $- q$ is constant, but distance between charges is changing, so force is changing, so speed and velocity are changing
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.