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Code No: R059210204
Set No. 1
II B.Tech I Semester Supplimentary Examinations, February 2008
( Common to Electrical & Electronic Engineering and Electronics & Control
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
(a) Define the term: “potential difference V(A) - V(B) between points A and B in
a static electric field”. Give an energy interpretation to potential difference.
(b) What are the equipotential surfaces for an infinite straight line of uniform
charge density? Explain.
(c) Potential for a certain region is given by V (x, y, z) = 300
volts; where x is in
meters. Find the electric field at the point P:(x= 1m).
(a) A conducting body is in the electric field of static charges. Explain why the
net electric field at any point inside the conducting body will be zero.
(b) Use the result of (a) to show that
i. the net volume charge density at any point inside the conductor is zero,
ii. the conductor is an equipotential body.
(a) A certain volume of dielectric has a polarization P¯ C/m2. Write the integral
expression for the potential at any point due to this dielectric. Explain the
different terms in this expression through a figure,
(b) A spherical dielectric shell has its center at origin, and its internal and external
radii are 49 cm and 50 cm respectively. The shell has a polarization of 3ar
nC/m2 (spherical coordinates). Considering only the bound surface density
on the outer surface, find the potential of the dielecltric shell.
(a) State Biot - Savart’s law for the magnetic field B due to a steady line current
in free space.
(b) Find B due