Question

A charge Q is moving `vec"dl"` distance in the magnetic field `vec"B"`. Find the value of work done by `vec"B"`.

Options

• -1

• Zero

• 1

• Infinite

Answer 1

Zero

Explanation:

The magnetic field of strength  `vec"B"` exerts a force on a charge particle with charge q moving with velocity `vec"v"` as shown by

`vec"F"_"m"="q"vec"v"xxvec"B"`

Since the magnetic field's force on a point charge is always perpendicular to `vec"v"`.

Therefore, The point charge experiences zero magnetic force work.