Electromagnetic Induction - Result Question 9

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

[2011]

(a)

(b)

(c)

(d)

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Answer:

Correct Answer: 9. (a)

Solution:

  1. (a) e=Ldidt

During 0 to T4,didt= const.

e=ve

During T4 to T2,didt=0

e=0

During T2 to 3T4,didt= const.

e=+ve

Thus graph given in option (a) represents the variation of induced emf with time.

Inductance does not play any role till there is a constant current flowing in the circuit. It opposes any change in the current in the circuit.



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