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EC 501 Wave Propagation and Radiation
Assignment Two: covers reading assignments, resistance, currents, current density,
magnetic flux density, magnetic force
1. A dc voltage of 6V applied to the ends of 1km of a conducting wire of 0.5mm radius
results in a current of 1/6A. Find
a)
The conductivity of the wire
b)
The electric field intensity
in the wire
c)
The power dissipated in the wire
d)
The electron drift velocity
assuming electron mobility in the wire to be 1.4x 10
3
m
2
/(Vs)
2.
What are the boundary conditions of the normal and tangential components of the
steady current at the interface of two media with different conductivities?
3. In a given region of space, the vector magnetic potential is given by
A
=
â
x
5cos
y
+
â
z
(2+sin
x) Wb/m
a)
Determine
B
b)
Calculate the magnetic flux passing through a square loop with 0.25m long edges
if the loop is in the xy plane, its centre is at the origin and its edges are parallel to
the x and yaxes.
4. In a cylindrical coordinate system, a 2m long straight wire carrying a current of 5A in
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This note was uploaded on 09/13/2010 for the course EE EE501 taught by Professor Sial during the Spring '10 term at YTI Career Institute.
 Spring '10
 Sial
 Flux, Volt

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