Homework Help: Maximum emg induced in coil

1. Nov 18, 2013

midwest

1. The problem statement, all variables and given/known data

A 104-turn coil rotates 7.14 times per second. The coil has a cross-sectional area of 0.670 m2 and the
magnetic field through the coils is 0.0720 T. What is the maximum emf induced in the coil?

2. Relevant equations

Honestly the rotating coil is throwing me off. But I think I should use Emax= NBAw

3. The attempt at a solution
Emax= NBAw
=104*.072 T * .67 m2 * 7.14 = 35.82

But I think that is wrong!

Thanks, Any direction is appreciated!

Last edited: Nov 19, 2013
2. Nov 19, 2013

Basic_Physics

The rotating coil causes the area that the magnetic field cuts through to change. In the ΔBA term only A changes. B stays the same. This means that the induced voltage will change from a minimum to a maximum and back as the coil rotates in the field. So you need to evaluate the ΔA/Δt term. that is by how much do the area change in what amount of time.

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