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Magnetic flux and induced emf

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Question

Some magnetic flux is changed from a coil of resistance 10Ω. As a result, an induced current is developed in it, which varies with time as shown in figure. Find the magnitude of the change in flux through the coil in weber.

Moderate
Solution

ϕ=Rq=Ridt

=Rarea under i - t graph

=1240.110=2Wb


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