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A tightly wound solenoid is connected to a DC source, and carries a current. Now the solenoid is stretched so that there are gaps between successive elements of the spiral coil, then

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the current will decrease

the current will increase

the current reverse its directions

the current will remain same

answer is C.

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Detailed Solution

As the gap between successive elements of the spiral solenoid increase, the magnetic flux leak through gaps. According to Lenz's law, the emf produced must oppose this decrease in flux due to leakage. Hence current will increase.

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