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Q. Two coils with self inductances 1H and 4H have a mutual inductance of 1H. The RMS value of current flowing in the two coils is 4A and 1A respectively. Find the coupling factor
Ans.
Given
Mutual inductance M = 1H
L1 = 1 H
L2 = 4 H
Given I1 = 4 Amp
I2 = 1 Amp
The total magnetic energy stored
W = 1/2L1I12 + 1/2L2I22 ±1/2MI1I2
W = {1/2 ×1 × 16 } + {1/2 × 4 × 1}± {1/2 × 1 × 4 × 1}
W = 12 or 8 watt
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