關於Electromagnet的意思和用法的提問

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Q: An electromagnet is a piece of metal which becomes magnetic when electricity is passed through it

An electromagnet is a piece of metal which becomes magnetic when electricity passes through it

Are both correct?
What's the difference?

A:

It’s literally two different ways to say exactly the same thing.

My stomach digests food when food is passed through it
My stomach digests food when food passes through it

To say that something “is passed“ is to imply that there is an agent who does the passing. That’s literally the only difference. In the context, it just doesn’t matter — the meaning is identical.

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