Question

A single loop of wire with area A carrying a current I has a magnetic moment µ = IA. If you wanted a single loop of wire with an area equal to the cross-sectional area of the magnet used here to have the same magnetic moment as your permanent magnet, how large a current would you need flowing through the loop?

Answer 1

The current would you need flowing through the loop is

`I'=(\mu 'I)/(\mu )`

Step-by-step explanation:

The magnetic moment is permanent, the area is equal to:

`A=(\mu )/(I)`

The current is:

`I'=(\mu ')/(A)`

Replacing the area value, the current is:

`I'=(\mu 'I)/(\mu )`