Q43 / 57 · JEE Advanced 2009 (Paper 2) · Physics

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).

  • Correct answer
    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

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.

Hence, the correct answer is option: 'A'.

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