# NCERT Physics Class 12 Exemplar Ch 5 Magnetism and Matter Part 4

Q.16 Verify the Gauss’s law for magnetic field of a point dipole of dipole moment m at the origin for the surface which is a sphere of radius .

Solution:

[due to integral]

Q.17 Three identical bar magnets are riveted together at center in the same plane as shown in Fig. This system is placed at rest in a slowly varying magnetic field. It is found that the system of magnets does not show any motion. The north-south poles of one magnet is shown in the Fig. Determine the poles of the remaining two.

Solution:

Net . Only possibility is shown in Fig.

Q.18 Suppose we want to verify the analogy between electrostatic and magnetostatic by an explicit experiment. Consider the motion of

(i) Electric dipole in an electrostatic field and

(ii) Magnetic dipole in a magnetic field .

Write down a set of conditions on so that the two motions are verified to be identical. (Assume identical initial conditions.)

Solution:

Mass and moment of inertia of dipoles are equal.

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