Q. Two coils of self-inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is :
A) 8 mH
B) 12 mH
C) 4 mH
D) 16 mH
Explanation
[Solution from source] With all the flux of one coil linking the other (coupling coefficient 1), M = √(L₁L₂) = √(2 × 8) = 4 mH. Adding the inductances (10 mH) or taking the larger one (8 mH) is incorrect. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.