Question

Magnetic potential energy U_m of compass needle of known magnetic moment m in a uniform magnetic field is ______.

Options

• `2vec"m"*vec"B"`

• `2pivec"m"*vec"B"`

• `vec"m"*vec"B"`

• - `vec"m"*vec"B"`

Answer 1

Magnetic potential energy U_m of compass needle of known magnetic moment m in a uniform magnetic field is `underline(- vec"m"*vec"B")`.

Explanation:

Negative times the scalar product of magnetic moment and magnetic field equals magnetic potential energy.