Statement 1: A rectangular current loop is in an arbitray oreintation in an external uniform magnetic field. No work is required to rotate the loop abour an axis perpendicular to its plane.
Statement 2: All positions represents the same level of energy.

Options

A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Answer

A

Explanation

`U=-vec(mu).vec(B)=-muB cos theta`
Since, `mu, B` as well as `theta` remains constant, `U` does not change.