Magnetic Field (coil electromagnet)

The magnetic field around a coil electromagnet can be increased by:

• Increasing the current flowing through the wire
• Adding loops on the coil (loops are long lengths of wire)
• Placing an iron or steel core inside the coil

Example: A basic electromagnet could be created by wrapping electic wire around a metal nail then attaching each end of the wire to different ends of a battery.

When a magnet is moved into a coil, an electrical current is induced. When the magnet stops, the induced current stops. When the magnet reverses, the electrical current reverses. By moving the magnet in and out of the coil we create an electric current.

There are 3 ways to increase the voltage?

• 1. Replace the original magnet with a stronger one
• 2. Increase the speed of the magnet
• 3. Increase the number of coils

This video explains about Electricity and Magnetism