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The maximum value of mutual inductance of 2 inductively coupled coils with self inductance LA = 49 mH and LB = 81 mH is ______________

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The maximum value of mutual inductance of 2 inductively coupled coils with self inductance LA = 49 mH and LB = 81 mH is ______________

(a) 130 mH

(b) 63 mH

(c) 32 mH

(d) 3969 mH
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Correct choice is (b) 63 mH

The explanation is: M ≤ K(sqrt{L_A L_B})

Maximum value of (M)

Or, Mmax = K(sqrt{L_A L_B})

Or, Mmax =  (sqrt{L_A L_B})

= (sqrt{40 ×81}) = 63 mH.
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