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What is meant by dielectric breakdown ?
Distinguish between permeability and permittivity.
Write the relation connecting M, B and H.
(7 x 2 = 14 marks)
Section C

Answer any five questions.
Each question carries 4 marks

Explain scalar potential and vector potential.

Derive the expression for the capacitance of two concentric metal shells with radii a and B.
Explain cyclotron motion and cyclotron frequency.

Explain electrostatic boundary conditions.

Derive the Poisson's equation and Laplace’s equation.

Derive an expression for the energy of a point charge distribution.

Write Ampere’s law in differential and integral form.
(5 x 4 = 20 marks)
Section D

Answer any four questions.
Each question carries 4 marks
A metallic sphere of radius 10 cm. has a surface charge density of 10 nC/m?. Calculate the energy
stored in the system.

A current distribution gives rise to the magnetic vector potential A = x2y “x + yx 5 -A xyz 2-
Calculate B at (— 1, 2, 5).

A 50 em. long solenoid having 500 turns and radius 2 cm. is wound on an iron core of relative
permeability 800. What will be the average e.m.f. induced in the solenoid if the current in it
changes from 0 to 2A 1೧ 0.05 87?

Two point charges - 4 uC and 5 pC are located at (2, — 1, 3) and (0, 4, — 2). Find the potential at
(1, 0, 1) assuming zero potential at infinity.
ctive metal plates 30 cm. x 50 cm. which are spaced

capacitor is constructed from two condu ಜ್‌ |
ಹಂ as its only dielectric material. Calculate the capacitance

6 mm. apart from each other, and uses dry air
of the capacitor.