Nalanda Open University
Annual Examination 2016
B.Sc. Physics (Honours), Part-III
Paper-VII (Classical Electrodynamics, Plasma Physics, Physics of Atoms,
Molecules and Nuclei)
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. All questions carry equal marks.
1. What is lienard-Wiechert potential? On its basis obtain electric and
magnetic field intensity due to a uniformly moving charge.
2. Explain electromegnetic field tensor. Find all the sixteen components of it
in terms of the electric and magnetic fields.
3. Discuss the covariance of maxwell's field equations under Lorentz
transpformations.
4. Discuss the microscopic and macroscopic properties of plasma. Explain
quasineutrality of plasma and Debye shielding and Debye length.
5. Distinguish between normal and anomalous Zeeman effects. How are they
explained theoritically?
6. Give the theory of rotational spectra of diatomic molecules treated as a non
rigit rotator.
7. Give the construction of He-Ne laser and the theory of its working. What is
an optically pumped laser.
8. Discuss angular momentum, magnetic moment and electric quadmpole
moment associated with an atomic nucleus. What is the importance of
these properties of a nucleus?
9. Give the theory of shell model of nucleus and on its basis explain the
angular momentum of the ground state of the nucleus.
10. Describe and discuss the Stern-Gerlach experiment to show the existence
of magnetic moment of an electron due to its spin.