because the copper wire in it is only magnetic when there is electricity running through it so when you turn of the electricity soure it is no longer magnetic
Permanet Magnet
An electromagnet would generally be better for lifting heavy metal objects as its magnetic strength can be easily controlled by adjusting the electrical current. A permanent magnet may not have sufficient magnetic strength to lift heavy objects, and it does not offer the flexibility of adjusting its magnetic force.
a electromagnet is bigger than a bar magnet
electromagnet
Iron, Cobalt and Nickel.
Perminant magnet
the world is
An electromagnet.
An electromagnet is a stronger magnet.
a temporary magnet can be created by an electromagnet but it can also be created by any type of strong magnet
An electromagnet can be turned on and off.
An electromagnet.