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Magnetism – 1 – 1

1. When a magnet is broken, each piece becomes a complete magnet because :

(a) the number of electrons in one piece are different from that of the other
(b) each piece becomes a complete magnet since molecular magnets cannot be broken
(c) the density of atoms in the pieces are different
(d) none of these

ANSWER

EXPLANATION

2. If p is the magnetic moment of a bar magnet in a magnetic field, than maximum value of the torque is :

(a) pBcos θ
(b) p cos θ
(c) 180°
(d) pB

ANSWER

EXPLANATION

3. The magnetic field at any point on the axial line of a short magnet is :

(a) equal to the magnetic field at an equidistant point on its equatorial line
(b) twice the magnetic field at an equidistant point on its equatorial line
(c) zero
(d) half the magnetic field at an equidistant point on its equatorial line

ANSWER

EXPLANATION

4. For a diamagnetic substance the susceptibility is :

(a) positive and very small
(b) positive and very large
(c) negative and very small
(d) zero

ANSWER

EXPLANATION

5. A magnet of pole strength m and length lis broken into two pieces. The pole strength of each piece is :

(a) m
(b) m/2
(c) 2m
(d) m/4

ANSWER

EXPLANATION

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