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A wire in the form of a tightly would so...

A wire in the form of a tightly would solenoid is connected to a `DC` source, and carries a current. If the coil is stretched so that there are gaps between successive elements of the spiral coil, then

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When the coil is stretched so that there are gaps between successive elements of the spiral coil i.e., the wires are the pulled apart which lead to flux leak through the gaps. According to Lenz's law, the emf produced must this decrease, which can be done by an increase in current. So, the current will increase.
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