The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?
Correct answer: C. 6 mH
- A. 4 mH
- B. 5 mH
- C. 6 mH
- D. 12 mH
Explanation
Mutual inductance is M = k√(L₁L₂) = 0.5√(8 × 18) mH = 0.5 × 12 = 6 mH. The coupling coefficient alone cannot be multiplied directly by either self-inductance.
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