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Among the following, which is the right formula for inductance of N turns?

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Among the following, which is the right formula for inductance of N turns?

(a) L=et/Ni

(b) L=N*i *e*t

(c) L=Ni/et

(d) L=N/iet

This question was posed to me in an interview for internship.

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

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Best answer
Correct option is (a) L=et/Ni

For explanation I would say: We know that:

emf=NLi/t

Inductance = L = et/N.

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