Is it true that coil wire is used in an electromagnet instead of straight wire because every coil behaves as a magnet?

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True

False

answer is A.

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Detailed Solution

The above statement is True. When a current is passed through a wire, it behaves like a magnet. The strength of the magnetic field depends on the shape of the conductor. A current-carrying straight wire forms a magnetic field in the form of concentric circles around it. As we move away from it, the circles become larger and larger. We know that the magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it. Therefore, if a circular coil has n turns, the field produced is n times as large as that produced by a single turn. Because the current in each circular turn has the same direction, and the field due to each turn adds up.
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