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Question

The current i in a coil varies with time t according to the graph shown below. Which of the following graphs, shows the induced emf (E) in the coil with time?



[0.77 Mark]

A
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B
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C
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D
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Solution

The correct option is C

We know that, induced EMF,

E=Ldidt

For AB, didt=0EAB=0

For BC, didt=ve and constant

EBC=+ve and constant

For CD, didt=+ve and constant ECD=ve and constant

Hence, the correct graph of induced emf (E) in the coil with time is,


Therefore, option (C) is the correct answer.

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