SP212/3321&5521
Chapter 32 - Worksheet #1
Question 1: A parallel plate capacitor is shown below. A current is charging the capacitor up. (a)
For points A and B, at which one is the magnitude of the magnetic field larger (or are they equal)?
(b) For points C and D, at which one is the magnitude of the magnetic field larger (or are they
equal)?
D
C
B
A
Question 2: A parallel plate capacitor consists of two air-filled circular plates of radius R=0.030 m
separated by a distance d=0.0035 m. At some instant in time, the electric field between the two
capacitor plates has an instantaneous magnitude of E=2500 N/C and is increasing in magnitude at
a rate of dE
=+15 N/(C·s). (a) What is the magnitude of the induced magnetic field at a point P ,
dt
which is midway between the two capacitor plates and r=0.050 m away from the central axis? (b)
How much current is flowing through the wire?
0.030 m
P
0.050 m
SP212/3321&5521
Chapter 32 - Worksheet #1
Question 3: A solenoid has a circular cross section with a radius of R=0.020 m, is 0.25 m long,
and is wrapped with N =305 turns (so n=1220 turns/m). The current flowing through the solenoid
di
= +0.75 A/s, this implies that the magnetic field strength inside the
is increasing at a rate of dt
di
solenoid is increasing at a rate dB
= µ0 n dt
=1.15×10−3 T/s. What is the magnitude of the induced
dt
electric field (a) at a distance r=0.010 m from the center of the solenoid and (b) at a distance
r=0.030 m from the center of the solenoid?