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Using Lenz's Law

Four substanc...

Question

Four substances, A, B, C, and D, are tested to be used as a core for an electromagnet. The results are given below. Which substance will be most suitable as an electromagnet of maximum strength?

Number of iron paper clips held to the electromagnet when the current is switched ON and switched OFF respectively.

A

5 ; 5

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B

10 ; 5

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C

5 ; 0

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D

8 ; 0

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Solution

The correct option is D 8 ; 0
.

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Similar questions

Q. Which statement about electromagnets is incorrect?
(a) They have a core of steel.
(b) They remain magnets when electricity is switched off.
(c) They can function only when electricity is switched on.
(d) They can be used to lift heavy iron loads.

Q. For different substances, hysteresis

(B - H)

curves are given as shown in figure. For making an electromagnet, which of the following is most suitable?

An electromagnet loses its magnetism when the current is switched off.

Q. Rama made an electromagnet and performed an experiment with it. The results of the experiment are shown in the table below.

Number of Coils Around the Iron Nail	Number of Paper Clips Attracted
10	5
20	8
30	11

From this Rama can conclude that
(a) increasing the number of coils increases the strength of the electromagnet.
(b) increasing the number of coils decreases the strength of the electromagnet.
(c) decreasing the number of coils increases the strength of the electromagnet.
(d) decreasing the number of coils does not affect the strength of the electromagnet.

Magnetism in an electromagnet can be switched on or off.

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