PH-101 Introductory Physics
Assignment #4 Submission Date: 23-05-2011
1) The capacitor in the figure given below consisting of two circular plates with radius R = 18.2cm
is connected to a source of emf. At what rate must the potential difference between the plates
with 2.0µF capacitance be changed to produce a displacement current of 1.5A?
Figure.1
2) A current 10 A flowing through a straight wire is split at point A in two semicircular wires of
radius 0.1 m. The resistances of upper and lower semicircular wires are 10 and 20
respectively. The currents rejoin to flow in the straight wire again as shown in the figure below.
Determine the magnitude and direction of magnetic field at the center “O”.
AmT
o/.1047
Figure.2
3) Four long copper wires are parallel to each other, their cross sections forming the corners of a
square with side a = 20cm. A 20A current exists in each wire in the direction shown in the figure
below. What are the magnitude and direction of B at the center of square?
Figure.3
docsity.com
