determine magnetic field of a bar magnet

[b]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=2.50×10-3 s

[b]2. Relevant equations
ε = RI
B=[itex]\mu0[/itex]I/2r
A= 7.85×10-3 m2
B= [itex]\phi[/itex]/Acos[itex]\theta[/itex]

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