P | Q | R | |
A | soft iron | brass | soft iron |
B | soft iron | soft iron | spring steel |
C | soft iron | brass | brass |
D | spring steel | soft iron | spring steel |
A) A
B) B
C) C
D) D
Correct Answer: B
Solution :
As P is acting as an electromagnet, it should be made of a soft-magnetic material such as soft iron. Q needs to be a magnetic material, such as soft iron, and R is a permanent magnet, thus it is made of steel.You need to login to perform this action.
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