Which of the following are magnetic materials?
A. Iron
B. Plastic
C. Nickel
D. Cobalt
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A, C and D only
Magnetic materials are those attracted by a magnet. Among common substances these are iron, nickel and cobalt and alloys such as steel.
A. Iron Correct. Iron is the most common magnetic material; magnets pick up iron nails and pins.
B. Plastic Incorrect. Plastic is a non-magnetic material; a magnet does not attract it, like wood, rubber and glass.
C. Nickel Correct. Nickel is attracted by a magnet and is used in some permanent magnets (alnico).
D. Cobalt Correct. Cobalt is attracted by a magnet and is also used in strong magnets.