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Magnetic field due to a solenoid

by musicmar
Tags: field, magnetic, solenoid
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musicmar
#1
Feb21-11, 10:10 PM
P: 100
1. The problem statement, all variables and given/known data
A 5-turn coil 1.0 cm in diameter is rotated at 10 rev/s about an axis perpendicular to a uniform magnetic field. A voltmeter connected to the coil through rotating contacts reads a peak value of 360 uV. What is the magnetic field strength?

3. The attempt at a solution

B=u0nI
u0= 8.85 x 10-12 C2/N m2
n = 5

I'm not exactly sure how to find the current.

I know that the induced EMF = Blv, but I don't know what to do about length.
v=omega*r = 0.05 m/s

So, once I find either the length or the current, I should be able to find B.
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