A huge electromagnet is often used to pick up cars. When the current is switched off, the magnet loses its magnetism and the car falls back down to the ground.
An electric motor uses the motor effect to spin a coil of wire inside a magnetic field.
To increase the speed of the motor:
- Increase the current in the coil.
- Increase the number of loops on the spinning coil.
- Increase the strength of the magnet.
If either the magnetic poles are swapped around or the current flows in the opposite direction the motor will spin in the opposite direction.
The alternating current that represents a sound wave flows through the coil. As the current carrying…