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2 D 12039
Explain the physical meaning of the equation of continuity.
What is the basic difference between electric and magnetic polarizations ?
(8 x 3 = 24 marks)
Section B (Paragraph/Problem Type)

Answer at least five questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 25.

Prove that the divergence of the curl of a vector is always zero.

Check whether E=k [9 + 21,29 + 3223], is a possible electrostatic field ? Here, 2 is a constant

with appropriate units.
Show that the energy of an ideal dipole p in an electric field E is given by U=- p.E.

Compare electrostatics and magnetostatics in terms of the Maxwell’s equations applicable. Compare
the nature of the fields with respect to their source.

Define the term surface current density. A current I flows down a wire of radius a. If the current

is uniformly distributed over the surface, what is the surface current density ?
Write an expression for the field of a magnetized object. Explain the terms involved.
Explain the domain model of ferromagnets.
(5 x 5 = 25 marks)
Section C (Essay Type)

Answer any one question.

The question carries 11 marks.

Discuss the divergence of a vector function and give its geometrical interpretation. Explain Green’s
theorem andillustrate it geometrically.

Explain the term electric potential. Obtain an expression for the electric potential of a localized

charge distribution.

(1 x 11 = 11 marks)

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