# Current in a rectangular coil

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The plane of a rectangular coil of dimension 5 cm by 8 cm is perpendicular to the direction of a magnetic field B. The coil has 29.7 turns and a total resistance of 12.8 Ohms.

At what rate must the magnitude of B change in order to induce a current of .227 A in the windings of the coil in units of T/s?

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#### Solution Preview

We have induced emf = df/dt

where df/dt is the rate of change of flux.

We have flux df = B.da = B*8*5cm^2 = ...

#### Solution Summary

Provides steps necessary to determine the rate of change in magnitude that must occur.

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