Multiple choice

The equivalent inductance measured between the terminals 1 and 2 for the circuit shown in the figure is

  1. L1 + L2 + M

  2. L1 + L2 – M

  3. L1 + L2 + 2M

  4. L1 + L2 – 2M
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sign of M is as per the sign of L if current enters or exits the dotted terminals of both the coils. The sign of M is the opposite of L if current enters in dotted terminal of a coil and exits from the dotted terminal of other coil. Thus, Leq = L1 + L2 – 2M

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