what will happen if we connect the battery to a pencil instead of nail ?
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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. ... The current flowing through the wire makes the wire hot and drains the battery quickly.
so wood is a insulator which current doesn't flow through it
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