Q. A coil of wire of certain radius has 100 turns and a self inductance of 15 mH. The self inductance of a second similar coil of 500 turns will be

A) 75 mH
B) 375 mH
C) 15 mH
D) None of these
Explanation

(b) $\frac{L_{2}}{L_{1}} = \frac{N_{2}^{2}}{N_{1}^{2}}$
$\therefore\ \ L_{2} = L_{1}\frac{N_{2}^{2}}{N_{1}^{2}} = 1.5\ \left( \frac{500}{100} \right)^{2} = 375\ $mH

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.