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

Ability to retain magnetism when current is removed

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Ability to induce e.m.f

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To undergo magnetostriction on removal of current

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Ability to change strength of magnetic field

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Solution

The correct option is B Ability to retain magnetism when current is removed
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Similar questions

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?

Q. Assertion

(A)

: The induced e.m.f. and current will be same in two identical loops of copper and aluminium when rotated with same speed in the same magnetic field.

Reason

(R)

: Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.

Q. Assertion :An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current. Reason: Above statement is in accordance with conservation of energy.

Q. An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:

(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet

Material A gets magnetised under the influence of external magnetic field while material B does not get magnetised. Material A retains the acquired magnetism for a long time. Material C magnetises under the influence of a magnetic field and does not retain it for a long time. Which of them is the most suitable to make electromagnets?

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

The correct option is B Ability to retain magnetism when current is removedundefined

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