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## Homework Statement

A generator is designed to produce a maximum emf of 180 V while rotating with an angular speed of 3900 rpm. Each coil of the generator has an area of 2.0×10−2 m^2.

a) If the magnetic field used in the generator has a magnitude of 4.1×10−2 T, how many turns of wire are needed?

## Homework Equations

emf = NABw ???

## The Attempt at a Solution

I'm not sure if this is even the correct equation, but my main problem is that I'm not really sure what the 3900 rpm is (i.e. what symbol it is and what it is in general). Any help would be appreciated.