Question

Why are electromagnets used in metal scrap yards?

A. They are temporary magnets, so they can be turned on or off.
B. They are temporary magnets, so eventually the metal just falls off.
C. They are weak permanent magnets.
D. They are very powerful permanent magnets.

Answer 1

yes he is right the correct answer is A i just took the test.

Answer 2

The answer is A. They are temporary magnets, so they can be turned on or off.

Step-by-step explanation:

Electromagnets are used in metal scrap yards because they are temporary magnets, so they can be turned on or off.

An Electromagnet consist of a soft ion core in a current carrying solenoid that is wound in opposite direction round the two arms of a bar.

They are temporary magnets and they loose their magnetic property the moment they are turned off.