Mutual Induction

Practice Questions:

Question 1: moderate

The mutual inductance between a primary and secondary circuits is 0.5 H. The resistance of the
primary and the secondary circuits are 20Ω and 5Ω respectively. To generate a current of 0.4 A
in the secondary, current in the primary must be changed at the rate of :

1. 4.0 A/s

2. 1.6 A/s

3. 16.0 A/s

4. 8.0 A/s

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Question 2: easy

Two circular coils can be arranged in any of the three situations shown in the figure. Their
mutual inductance will be :

1. maximum In situation (a)

2. maximum In situation (b)

3. maximum In situation (c)

4. the same in all situations

View Answer

Based on the visual arrangement of the coils, the mutual inductance is maximum in situation (a).

This is because the coils are placed co-axially (one above the other), allowing the maximum amount of magnetic flux from the primary coil to pass through the secondary coil, resulting in the highest coupling coefficient.

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