Lots of things can change it like a bigger planet right next to earth, a black hole, even humans. Those are the things I can come up with so far, but all I know that it has to be either huge and/or destructive.
If the liquid center of the Earth is charged and rotating, it creates a magnetic field. If the rotating is reversed, for any reason, the magnetic field reverses.
Electrical energy is used to create a electromagnet with alternating poles. These alternating poles will cause another magnet with constant poles attached to an armature to turn and create mechanical energy.
SOME Electromagnet like permanent magnets have two poles(north/south). Likewise the rules for SOME Electromagnets are the same as those of a permanent magnet(same poles repel, different poles attract).
Add a battery
North + North/South + South = RepelNorth + South/South + North = AttractA.An iron pipeB.An aluminum wire carrying currentE.An electromagnet
Mainly in that the electromagnet is NOT permanent. In other words, it can be switched on and off.Another relevant difference is that the electromagnet constantly requires power, at least while it is on.
Electrical energy is used to create a electromagnet with alternating poles. These alternating poles will cause another magnet with constant poles attached to an armature to turn and create mechanical energy.
The poles of an electromagnet can change depend inf on the current supplied.
Magnetic poles
The poles of the electromagnet are repelled and attracted to the poles of the field magnet in the motor, causing it to spin a commutator or rotor in the motor. A brush flips the poles to keep the electromagnet spinning and the rotor moving.
dynamo
electromagnet
Nothing - The polarity of an electromagnet depends on the direction of current flow and you can effect the same change in orientation to the earth's field by moving the electromagnet rather than the earth's field.
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.
The earth is an electromagnet. It has a north pole and a south pole. Apex: A magnet always has two poles, earth is a elecrtomagnet
The comon bar magnet has two poles, and the electromagnet can be turned on and off also the electromagnet uses electricity to create a magnetic field in the first place. so the difference is normal magnet cant be turned on and off but the electromagnet can. does that answer ur question?
because of the magnetic field.
No. magnets always have two poles, (even electromagnets). Designated North and South.