By explaining diamagnetic, paramagnetic and ferromagnetic substances, analyse their characteristic properties.###Define diamagnetic, paramagnetic and ferromagnetic substances and analyse their characteristics on the basis of (a) reason for magnetic property (b) relative magnetic permeability (c) magnetic susceptibility (d) intensity of magnetisation (e) magnetic induction.
Compare three magnetic substances on the basis of following properties : (i) Behaviour in magnetic field (ii) Main reason for magnet formation (iii) Behaviour in non-uniform magnetic field (iv) Behaviour on bringing magnetic pole near (v) Magnitude of $\mu_r$ (vi) Number of field lines passing through substance in magnetic field (vii) Direction of magnetisation.
Define the following and establish relation between them : (i) intensity of magnetisation (ii) magnetisation field (H) (iii) magnetic susceptibility $\chi$, (iv) magnetic permeability.###Explain permeability, susceptibility, intensity of magnetisation and magnetisation field $( H )_{ X }$ and state their units. Establish relation between them in M.K.S. system.
Calculate force pair required to deflect a bar magnet by $\theta^{\circ}$ in a uniform magnetic field and on this basis define magnetic moment and calculate torque at $\theta=0^{\circ}$ and $\theta=90^{\circ}$.###Calculate moment of force acting on a bar magnet which is deflected by an angle in a uniform magnetic field by drawing a diagram and on this basis define magnetic moment and calculate torque at $\theta=0^{\circ}$ and $\theta$ $=90^{\circ}$.