Under the influence of the coulomb field of charge +Q, a charge −q is moving around it in an elliptical orbit. Find 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 I am blank at this one. I don't know how to find either one, especially since this is elliptical orbit. All I know is that since it is elliptical orbit, speed is not constant, so is velocity and thus, linear momentum. Now I am confused between what is constant, angular velocity or angular momentum. I tried balancing electrostatic force with centrifugal force at any arbitrary point, but so far, I didn't got any satisfactory conclusions from my efforts.