Question 350: Electromagnetic Induction

Question

The current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time  would be

Accepted Answer

e = -L$${{di} \over {dt}}$$
During 0 to $${T \over 4}$$, $${{di} \over {dt}}$$ = constant
$$ 	herefore $$ e = -ve
During $${T \over 4}$$ to $${T \over 2}$$, $${{di} \over {dt}}$$ = 0
$$ 	herefore $$ e = 0
During $${T \over 2}$$ to $${3T \over 4}$$, $${{di} \over {dt}}$$ = 0
$$ 	herefore $$ e = +ve
Thus graph given in option (a) represents the variation of induced emf with time.

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Electromagnetic Induction

The current $i$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be

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