Ten questions. The result tells you which lessons you may skip.
A bar magnet has poles of strength \(20\,\text{A m}\) that are \(5\,\text{cm}\) apart. Its magnetic moment is
At equal distances from a short magnet, the field on its axial line compared with the field on its equatorial line is
A magnet of moment \(2\,\text{A m}^2\) lies at \(90°\) to a uniform field of \(0.1\,\text{T}\). The torque on it is
At a place \(B_H = 3 \times 10^{-5}\,\text{T}\) and the dip is \(45°\). The vertical component of the Earth's field is
A dip circle is turned so that its plane lies magnetic east-west. The needle
A bar magnet lies along the meridian with its N pole pointing north. Its neutral points lie
A short magnet is placed at one distance from the needle of a deflection magnetometer. It is used first in the tan A position, then in tan B. The ratio \(\tan\theta_A/\tan\theta_B\) is
Two magnets of equal moment of inertia swing in the same field with periods of \(1\,\text{s}\) and \(2\,\text{s}\). The ratio of their moments is
A paramagnetic salt has a susceptibility of \(6 \times 10^{-4}\) at \(200\,\text{K}\). At \(400\,\text{K}\) its susceptibility is
The material for a permanent magnet should have