how can we interchange the N pole and S pole of the electromagnet?
Answers
Answer:
How can we decide the north and south pole of electromagnet and can we reverse the poles?
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Tom McNamara
Answered 5 years ago
Use the force!
Bring the electromagnet close to a permanent magnet whose poles are marked. As you know, like poles repel each other and unlike poles attract. If you can feel the force, that gives you your answer.
If the force is too weak to feel that way, you can (carefully) bring a magnetic compass near your electromagnet. A tricky part here is the "N" pole of the compass needle is the one that points to the magnetic north pole of the Earth. So a compass needle will lean towards the N pole of your electromagnet. Here's a neat article on using a compass to measure pretty small magnetic fields: How Do You Measure the Magnetic Field?
If you don't have any marked magnet, you can work it out theoretically. Figure out which direction the current is flowing around the wires. (Current flows from the "+" end of the battery to the "-" end.)
Hold your lightsaber
Orient the fingers of your right fist to align with the direction of current flow.
Source: Physics stack exchange. Is it possible to make an electromagnet with two like ends?
You can reverse the poles by reversing the current. Just swap the wires at the battery.
Warnings -- I didn't have these warnings when I started playing with electromagnets around age 8, and I did various kinds of damage, so please be patient if these warnings sound overprotective.
Be careful with homemade electromagnets, use a weak little battery as a power source so you don't electrocute yourself. Don't leave it connected when you wander off. Also there is no fundamental difference between an electromagnet and the electric burner on a stove. In both cases the wires can get very hot. If you're lucky the copper will melt (yep) and fuse open before you touch it and burn yourself. Don't bring a powerful magnet too close to a magnetic compass, that can wreck the compass in several different ways.