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The value of mutual inductance can be increased by

1. decreasing N
2. increasing
3. winding the coil on wooden frame
4. winding the coil on china clay

Correct answer: winding the coil on china clay

Solution

Mutual inductance increases when the coils are coupled more strongly, which happens with a better magnetic core. Among the options, china clay is the intended nonconducting, nonmagnetic support that allows the coil arrangement to favor stronger coupling compared with reducing turns or using an unsuitable frame.

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