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Electromagnet

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Question

A student took a test tube and wound 100 turns of copper wire around it. Next he filled water in the tube and made an iron nail float on it. he then connected the ends of the copper wire to a cell. the pictures here show his experiment. Can you say why the nail is at different positions in the two pictures shown here?
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Solution

The second position of the iron nail in the picture is different from its first position because of the magnetic effect of electric current. When current is passed through the copper coil, a magnetic field is produced and the iron nail gets magnetised and sinks in water.

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