An electromagnet's intensity can be improved by increasing the number of wire loops from around iron core as well as the current or voltage. By stroking a piece of iron or steel (such as a needle) around a permanent magnet, you can create a temporary magnet.
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Answer:
An electromagnet's intensity can be improved by increasing the number of wire loops from around iron core as well as the current or voltage. By stroking a piece of iron or steel (such as a needle) around a permanent magnet, you can create a temporary magnet.