This is a quick and simple experiment to answer the question of magnetic field strength: Do four magnets have a stronger magnetic pull than one? You’ll find the answer quite surprising… which is: it depends. Here’s what you need to do to see for yourself:
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Yes – you’re hearing the electromagnetic waves in the audible range – it’s making a small part of the lamp vibrate and you can detect with with your ears!
Hi Aurora, when I put a magnet against a desk lamp, I heard a rrrrrrr sound and when I took away the magnet, the sound stopped. I was wondering if it was an electro-magnetic field. Is it?
Right… there are TWO sets of exercises. One for the entire Lesson which includes several different experiments, and one smaller set for the experiment itself. Does that help clarify things?
The link to the student exercises goes to a different experiment that doesn’t match this one.