A 15.7-cm-radius coil with 60 turns is placed in a changing magnetic field with

Question

A 15.7-cm-radius coil with 60 turns is placed in a changing magnetic field with its axis pointing 25.0 degrees away from the magnetic field direction. a. If the magnetic field is decreasing at a rate of 0.0525 T/s what is the emf induced? b. If the magnetic field is pointing up through the center of the coil as viewed by someone looking down upon it, which way will they see the induced current flow? c. If there is a total of 12.0 resistance, what is the induced current and power dissipated by the coil?

Explanation / Answer

Induced emf=- N change in flux /time

Flux=B.A

Change in flux =d (B.A)/dt=0.0525×3.14×0.157×0.157

Emf=0.221V

Induced current =0.221/12=0.018A

Power=I^2R=0.0041W

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