Both sapphire and ruby are a crystallized form of the compound aluminium oxide which is a good insulator.
its an insulator
insulator
it’s a insulator
an insulator
Both sapphire and ruby are a crystallized form of the compound aluminium oxide which is a good insulator.
insulator
It is an insulator.
its an insulator
insulator.
Insulator
Insulator
insulator
Insulator
it’s a insulator
an insulator
Rubber is an insulator for normal voltages.