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

Options

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` changes
D. The linear speed of the charge `-q` is constant

Answer

A, C

Explanation

When `-q` moves in an elliptical orbit about Q as in solar system, the angular momentum is a constant. But the linear velocities and hence linear momentum will not be a constant
`Iomega=mr^(2), (v)/(r)=mvr` changes
As r changes, v as well as `omega` changes, but `Iomega` = constant