Under the influence of the coulomb field of charge $+$ A, a charge $-$ q is moving around it in an elliptical orbit. Find out the correct statement(s).

The angular momentum of the charge

-

q is constant

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The linear momentum of the charge

-

q is constant

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The angular velocity of the charge

-

q is constant

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The linear speed of the charge

-

q is constant

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Solution

The correct option is A The angular momentum of the charge $-$ q is constant
Given that a charge $- q$ mover under the influence of a coulombic field of charge $+ A$ . The charge $- q$ moves in an elliptical orbit. Therefore, the angular momentum of the charge $- q$ about charge $+ A$ is constant, since the torque on the charge is zero.

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Q. Under the influence of the Coulomb field of charge

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is moving around it in an elliptical orbit. Find out the correct statements.

A positive point charge +Q is fixed in space. A negative point charge -q of mass m revolves around a fixed charge in elliptical orbit. The fixed charge +Q is at one focus of the ellipse. The only force acting on negative charge is the electrostatic force due to positive charge. Then which of the following satement is true.