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Standard VI
Physics
Temporary and Permanent Magnets
Which of the ...
Question

Which of the following statements are true for permanent magnet?
a. It is made of steel
b. It has a strong magnetic field which can be altered
c. Polarity cannot be reversed
d. Used in electric meters, magnetic compasses etc

A
a, c and d
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B
b, c and d
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C
a, b and c
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D
All of the above
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Solution

The correct option is A a, c and d
A permanent magnet is a naturally occurring magnet. However it is not strong enough and occurs in any shape. Thus a strong permanent magnet is made of steel by passing current through an insulated coil wound over it. It produces a permanent magnetic field and polarity that cannot be altered. Also it cannot be demagnetized easily.

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a. Made of soft iron.
b. Strength of magnetic field can be changed.
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Q. Write answers to the following questions:

(a) Distinguish between the two methods of making artificial magnets.

(b) Which substances are used for making electromagnets?

(c) Write a note on 'magnetic field'.

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(B) An emf can be induced by changing the magnetic field.

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(b) A is true but B is false.
(c) B is true but A is false.
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Choose the correct answer from the options given below.
Q.

Which of the following statement is/are true

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