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 statements.

• 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 correct option is A The angular momentum of the charge $-q$ is constant.

Coulomb field of charge $=+Q$

a charge $=-q$

The angular momentum of the charge $-q$ is constant.

angular momentum of the charge $=(-q)$ $K$.

$F=\frac{kq(-Q)}{r^2}$

angular momentum $=K\left(mV\right)$