NCERT Physics Class 12 Exemplar Ch 5 Magnetism and Matter Part 3

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Very Short Answer Types Questions

Q.11 A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials?

Solution:

and

because .

Q.12 A permanent magnet in the shape of a thin cylinder of length has . Calculate the magnetization current .

Solution:

and

Q.13 Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of (at STP) and .

Solution:

.

Now

(From given data).

Hence major difference is accounted for by density.

Q.14 From molecular view point, discuss the temperature dependence of susceptibility for diamagnetism, Paramagnetism and ferromagnetism.

Solution:

Diamagnetism is due to orbital motion of electrons developing magnetic moments opposite to applied field and hence is not much affected by temperature. Paramagnetism and ferromagnetism is due to alignments of atomic magnetic moments in the direction of the applied field. As temperature increases, this aligment is disturbed and hence susceptibilities of both decrease as temperature increases.

Q.15 A ball of superconducting material 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?

Solution:

(I) Away from the magnet.

(ii) Magnetic moment is from left to right

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