Question

What is the self-inductance of the coil, if the magnetic flux of 10 microwebers is linked with a coil when a current of 5 mA flows through it?

(a) 20 mH

(b) 5 mH

(c) 2 mH

(d) 250 mH

The question was posed to me in semester exam.

The above asked question is from Electromagnetic Inductance in chapter Electromagnetic Induction of Physics – Class 12

Answer 1

Correct answer is (c) 2 mH

The explanation is: Self-inductance = \(\frac {Magnetic \, flux}{Current}\)

Self inductance = \(\frac {10 \times 10^{-6}}{5 \times 10^{-3}}\)

Self inductance = 2 × 10^-3 H

Self inductance = 2mH