# Determine magnetic field of a bar magnet

1. Mar 31, 2014

### britt

1. It is desired to determine the magnetic field of a bar magnet. The bar magnet is pushed through a 10.0-cm diameter circular coil in 2.50 × 10-3 s and an emf of 0.750 V is obtained. Find the magnetic field of the bar magnet.

ε = 0.750 V
d=0.10 m
t=2.50x10-3 s

2. Relevant equations
ε = RI
B=$\mu0$I/2r
A= 7.85x10-3 m2
B= $\phi$/Acos$\theta$

2. Mar 31, 2014

### Staff: Mentor

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