Question

Three specimens of magnetic material were tested using the apparatus shown in the diagram.
When the switch is closed, the specimen picks up some of the iron nails but when the switch is opened, many or most of the nails fall off. The number of nails picked up and left on were found for three specimens. The table shows the results.

Specimen	Number of nails picked up	Number of nails left on
X	35	4
Y	20	10
Z	40	3

What does the number of nails left on the material infer to?

• A. Ability to retain magnetism when current is removed
• B. Ability to induce e.m.f
• C. To undergo magnetostriction on removal of current
• D. Ability to change strength of magnetic field

Answer 1

The correct option is A Ability to retain magnetism when current is removed

The number of nails left on the material infer to the ability to retain magnetism when current is removed.