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## Homework Statement

You have a coil of N turns, with current I through it.

It is in a magnetic field B, which causes it to feel a torque.

Give an expression for its magnetic dipole moment.

## Homework Equations

## The Attempt at a Solution

Well, I know magnetic dipole moment is A x I

So for a coil of N turns it should be A x IN.

The problem is, A isn't specified in the problem, which makes me wonder if there's a better/different way to do this. Any ideas?