Question

Why is an electromagnet used instead of a permanent magnet in magnetic cranes?​

Answer 1

Answer:

an electromagnet is a metal which has the ability to turn into a magnet on passing electricity through it .

But once the electric flow is withdrawn the circuit breaks and it no more behaves like a magnet.

but this is not so in permanent magnets

Explanation:

thus electromagnet is used in magnetic cranes bcoz their magnetism can be controlled conveniently.

Answer 2

Answer:

electromagnet is an artificial magnet which works on the electric current.

it has many interesting features which makes it more useful than the ordinary magnets ;

• it can be demagnetized by stopping the current passing through it.

• it's poles can be changed by changing the direction of current.

• it's magnetic strength can be changed.

and electro magnet is used in cranes because big iron materials can be transported to one place to another easily by using its feature of being demagnetized easily.

i hope it helped.....