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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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Q. The following properties belong to which magnet?
a. Made of soft iron.
b. Strength of magnetic field can be changed.
c. Strong magnetic field but can be easily demagnetized
d. Polarity can be reversed
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'.

(d) Why is a magnetic needle used in a compass?

(e) Explain with the help of a diagram how the intensity and direction of the magnetic field of a bar magnet can be determined.
Q. Consider the following statements:
(A) An emf can be induced by moving a conductor in a magnetic field.
(B) An emf can be induced by changing the magnetic field.

(a) Both A and B are true.
(b) A is true but B is false.
(c) B is true but A is false.
(d) Both A and B are false.
Q. Which of the following statements are correct?

(A) Electric monopoles do not exist, whereas magnetic monopoles exist.

(B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and are confined.

(C) Magnetic field lines are completely confined within a toroid.

(D) Magnetic field lines inside a bar magnet are not parallel.

(E) χ=−1 is the condition for a perfect diamagnetic material, where χ is its magnetic susceptibility.

Choose the correct answer from the options given below.
Q.

Which of the following statement is/are true

(i) As long as a metal has some iron in it, you can magnetize it using a magnet

(ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.


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