Insulator of electricity is a correct phrase to use.
Insulator of heat is a correct phrase.
Copper is a magnetic material.
Which of the following are magnetic materials?
Cobalt
Copper
Zinc
Iron
Aluminium
Steel
Nickel
What are the two poles of a magnet?
North
South
West
East
North-West
North-East
South-East
South-West
A magnet is the strongest at its poles.
Like poles repel.
A magnet can lose its magnetism by
being dropped on the floor repeatedly
being heated
being frozen in a refrigerator
being separated into two pieces
being thrown away