Under the influence of the coulomb field of charge $+Q$, a charge $-q$ is moving around it in an elliptical…

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).
  1. The angular momentum of the charge $-q$ is constant
  2. The linear momentum of the charge $-q$ is constant
  3. The angular velocity of the charge $-q$ is constant
  4. The linear speed of the charge $-q$ is constant

Solution

Net torque on $(-q$ ) about a point (say $P$ ) lying over $+Q$ is zero. Therefore, angular momentum of $(-q)$ about point $P$ should remain constant.

Asked in: JEE Advanced 2009 (Paper 2)

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