Is it true an electromagnet made by winding $50$ turns of wire over an iron screw will attract more pins than the electromagnet by winding $100$ turns over a similar iron screw?

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True

False

answer is B.

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Detailed Solution

The above statement is False.
When a long wire is wound over an iron screw in the coil's pattern and then connected to the cell via a switch, so as soon as the switch is on, the circuit gets complete and current starts flowing through the coil. Thus the coil behaves like an electromagnet. If we bring the iron nail near this arrangement, the nails will cling to the screw. This electromagnet can be made very strong if the number of turns in the coil is increased. As the circuit gets open, all its magnetism loses.
The correct statement would be an electromagnet made by winding