Question

While both permanent magnets and electromagnets attract objects through magnetism, they differ in function and purpose. Choose the three statements correctly describing permanent magnets and/or electromagnets.

a) An electromagnet's magnetism comes from an insulated wire wrapped around a material like iron.
b) A permanent magnet requires more parts than an electromagnet to become magnetized.
c) Electromagnets are often used in scrap yards to pick up heavy scrap metal.
d) The magnetism in an electromagnet can be turned on and off.
e) Electromagnets are the most reliable magnets because they are not affected by power failures.

Answer 1

An electromagnet's magnetism comes from an insulated wire wrapped around a material like iron. Electromagnets are often used in scrap yards to pick up heavy scrap metal. The magnetism in an electromagnet can be turned on and off. Option A,C,D are correct.

Step-by-step explanation:

a) An electromagnet's magnetism comes from an insulated wire wrapped around a material like iron.

Correct. An electromagnet is created by passing an electric current through a wire wrapped around a material such as iron. The electric current creates a magnetic field, which magnetizes the iron and makes it attractable to other objects.

c) Electromagnets are often used in scrap yards to pick up heavy scrap metal.

Correct. Electromagnets are commonly used in scrap yards to lift and move heavy scrap metal. The strong magnetic field created by the electromagnet allows it to attract and hold onto the metal, making it easier to transport.

d) The magnetism in an electromagnet can be turned on and off.

Correct. The magnetism in an electromagnet can be switched on and off by controlling the flow of electric current. When the current is flowing, the electromagnet is magnetized and attracts objects. When the current is turned off, the magnetism is lost and the electromagnet no longer attracts objects.