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The current flowing in two coaxial coils is in the same direction. On increasing the distance between the two coils, the electric current will

1. Increase
2. Decrease
3. Remain unchanged
4. The information is incomplete

Correct answer: Decrease

Solution

When the distance between two coaxial coils increases, the mutual inductance decreases, so the flux linked with each coil due to the other reduces. By Lenz's law, the induced effect opposes this reduction, which means the current tends to decrease rather than increase.

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