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If either the inductance or the rate of change of current is doubled, the induced e.m.f?

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If either the inductance or the rate of change of current is doubled, the induced e.m.f?

(a) Remains constant

(b) Becomes zero

(c) Doubles

(d) Becomes half

The question was posed to me by my college director while I was bunking the class.

Enquiry is from Inductance in Terms of Flux Linkages Per Ampere in chapter Inductance in a DC Circuit of Basic Electrical Engineering

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Right answer is (c) Doubles

To explain I would say: If either the inductance or the rate of change of current is doubled, the induced e.m.f. becomes double because of emf=LI/t.

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