Question

For 2 coupled inductors LA and LB, their mutual inductance MLALB satisfies ____________

(a) MLALB  = (sqrt{L_A^2 + L_B^2})

(b) MLALB > (frac{(L_A + L_B)}{2})

(c) MLALB > (sqrt{L_A L_B})

(d) MLALB ≤ (sqrt{L_A L_B})

Answer 1

The correct choice is (d) MLALB ≤ (sqrt{L_A L_B})

The best explanation: M = K (sqrt{L_A L_B})

Or, K = (frac{M}{sqrt{L_A L_B}})

∴ K≤1

∴ (frac{M}{sqrt{L_A L_B}}) ≤ 1

Or, M ≤ (frac{M}{sqrt{L_A L_B}}).