Question

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

Answer 1

The angular momentum of the charge -q moving in an elliptical orbit around Q is constant

• The angular momentum for the charged particle -q as the electrostatic force is passing through the axis which makes the torque value equal to zero

• As it as elliptical orbit the distance of object from the body is changing, so the velocity of -q keeps changing its direction to make angular momentum constant

• The linear speed of -q is also not constant because its value changes in such a way that the angular momentum for the charge is constant