Consider the plane S formed by the dipole axis and the axis of the earth. Let P be point on the magnetic equator in S. Let Q be the point of intersection of the geographical and magnetic equators. Obtain the declination and dip angles at P and Q.

2

(a)

From molecular view point, discuss the temperature dependence of susceptibility for diamagnetism, paramagnetism and ferromagnetism.

2

(a)

A ball of superconducting matesial is dipped in liquid nitrogen and placed near a bar magnet.
(i) In which direction will it move?
(ii) What will be the direction of its magnetic moment?

2

(a)

Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of \(\mathrm{N}_{2}\left(\sim 5 \times 10^{-9}\right)\) (at STP) and \(\mathrm{Cu}\left(\sim 10^{-5}\right)\)

2

(a)

A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials?

2

(a)