Electrostatics 7 Question 21
23. Under the influence of the coulomb field of charge $+Q, \mathrm{a}$ charge $-q$ is moving around it in an elliptical orbit. Find out the correct statement(s).
(2009)
(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
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Answer:
Correct Answer: 23. (a)
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.
