90,

81,

82,

88.

34

86.

4 C 80023

The electric field in some region of space in found to be 0 ‏٭‎ kr? # in wpherieal Co-ordinates, where

kis some constant and ¢ in the unit vector, F ind the charge density,

In an electric field, the potential at any point in given by ७ 97 - By? + 22% volts. Find the
expression for electric field intensity at a point (2,3,1). Alno find its magnitude,

(44 16 marks)
Section E

Answer any two questions.
Each question carries 10 marks,

Show that the potential due to a polarized dielectric is the same as that produced by a volume
charge density and surface charge density.

Use Gaune's law to find the electric field:
(a) Outside a uniformly charged solid sphere of radius R and total charge q.
(b) Ata distance from an infinite plane of uniform surface charge density.

Explain the following types of magnetic materials ; (a) Paramagnets ; (b) Diamnagnets ; and
(c) Ferromagnets.

(a) State and explain Biot Savart's law.

(b) Derive an expression for the magnetic field due to a circular loop of current at a point on the
axis of the coil.

(2 x 10 = 20 marks)