tightness of the wire around the core or nail.what happens if we tighten the wire?
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The more loops the coil has, the stronger the magnetic field, while the current is flowing. ... But when you coil the wire around an iron nail, the magnetic domains inside the nail line up and make a strong, temporary magnet. If you disconnect the wire, the magnetic field disappears and the nail is no longer a magnet.
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ANS : Number of coils of wire around the nail. Compare the results if you coil the wire
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