3 WAYS TO INCREASE THE STRENGTH OF AN ELECTROMAGNET
* INCREASE NUMBER OF COILS THAT WRAP AROUND THE CORE
* INCREASE THE CURRENT FLOWING THROUGH THE COIL
* CHANGE THE CORE MATERIAL TO BEST SUIT THE ELECTROMAGNET

fluxlines

Magnetic flux (Greek letter Φ (phi)), is a measure of the magnetic field strength existing on a two dimensional surface, such as one side of a magnet.

1. cant cross
2. try to shorten
3. north to south
4. cant be broken