*28.  A flat circular coil with 105 turns, a radius of 4.00 x 10-2 m, and a resistance of

0.480 W is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of , thereby inducing a current in the coil. Find the magnitude of the magnetic field at the center of the coil that is produced by the induced current.

 

The magnetic field at the center of the coil is found from Ampere’s law and is

 

 

The current induced is gotten from Ohm’s law

 

 

And the emf induced is given by

 

 

 

 

 

 

 

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This page last updated on June 24, 2018