Two coils of self inductance 2 mH and 8 mH are place So close together that the effective flux in one coil completely linked with the other. The mutual inductance between these coils is:
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Two coils of self inductance 2 mH and 8 mH are place So close together that the effective flux in one coil completely linked with the other. The mutual inductance between these coils is:

G1 Physics · Accepted Answer

Step 1: Mutual inductance satisfies M² ≤ L₁L₂ for passive coupled coils. Step 2: When flux of both coils is completely linked (coupling coefficient k = 1), M = √(L₁L₂). Step 3: M = √(2 mH × 8 mH) = √16 mH = 4 mH. Answer D. Final answer: (D) 4mH.