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You get an electro-magnet. If the current only flows in one direction (Direct Current) then you get a magnet.

I magnetised a big steel penknife that I had at the age of 14. Using 240 volt AC (Alternating Current) mains current I wired it up with a small piece of fuse wire in the circuit. The theory was that the current would flow in one direction and then blow the fuse before it had a chance to flow back the other way. And the knife was magnetised.

It worked! But the fuse I used was stronger than the fuse in the fuse box, so I blew all the power in the house. My father was furious, and amazed that the instructions were there in a book he'd given me "100 things a Boy can Do before he dies".

(Actually just "100 Things a Boy can Do"!!)

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βˆ™ 15y ago
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βˆ™ 11y ago

A coil of wire or a coil in the shape of a cylinder is a typical shape for an electromagnet (or a solenoid). The strength of the magnetic field of an electromagnet can be increased significantly if the coil is wrapped around an iron core.

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βˆ™ 15y ago

An electromagnet.

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βˆ™ 13y ago

electromagnet

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βˆ™ 6y ago

It creates a magnet and magnetism.

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Q: A current carrying wire wrapped around an iron core?
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