Sara and Greg built an electromagnet in science class. They wrapped 50 turns of copper wire around an iron nail and hooked the ends of the wire to a 1.5 volt battery. They picked up 15 paper clips with their electromagnet, but they want to make it stronger. What should they do?

C) Wrap more turns of wire around the nail.

Explanation:

One of the main determinants of the strength of a magnet is the number of rounds of wire around the magnet. This is because, the more wire there is, the more electricity will pass through and the more powerful the magnet will become.

They should therefore wrap more turns of wire around the nail so that more electricity can flow from the battery. This will make their magnet stronger and enable it to pick up more paper clips.

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