PHY2061
R. D. Field
Problems
Chapter 38
Page 1 of 5
C
R
ε
Chapter 38 Problems
Problem 1:
A parallel-plate capacitor whose plates have radius
R
is being charged by a
current
I
.
What is the magnitude of the magnetic field (
in Tesla
) between
the plates a distance
r = R/2
from the center?
Problem 2:
A parallel-plate capacitor whose plates have radius
r
is
being charged through a resistor
R
by an EMF
ε
as shown
in the
Figure
.
If the switch is closed at
t = 0
, what is the
maximum magnitude of the magnetic field between the
plates of the capacitor a distance
r/2
from the center?
(Note: k =
µ
0
/4
π
)
Problem 3:
The potential difference,
V
C
, across a
3 Farad
parallel-plate capacitor
whose plates have radius
R = 2 cm
varies with time and is given by
V
C
(t) =
at
, with
a = 10 V/s
.
What is the magnitude of the magnetic field (
in
microT
) between the plates of the capacitor a distance
R
from the center?
Problem 4:
A
2 milliFarad
parallel-plate capacitor whose plates are circular with radius
R = 0.5 cm
is connected to an EMF-source that increases uniformly with
time at a rate of
150 V/s
.
What is the magnitude of the magnetic
field (in
microTesla
) between the plates of the capacitor a distance
r = R
from the
center?

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PHY2061
R. D. Field
Problems
Chapter 38
Page 2 of 5
z-out
R
Problem 5:
Consider the situation illustrated in the figure.
A
uniform electric field points in the
z direction
(out
of the paper

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