This preview shows page 1. Sign up to view the full content.
SOLVING PROBLEMS 19 and 20
April 19, 2010
Problem 19
(like 24.19): A Hertzian resonator has a capacitance of 1 picoFarad and inductance of 1
microHenry. The spark gap breaks down at 10 kV and the resonator oscillates with an energy decay time
of 5 microseconds. What is the frequency of the oscillation?
What do you know?
First of all, it doesn’t matter that it is Hertzian or Schmertzian. The angular
frequency is 1 over the square root of L times C so the frequency is
2
10
1
2
1
9
LC
f
Hz = 159 MHz
a)
159 MHz;
b)
159 mHz;
c)
159 kHz;
d)
159 GHz;
e)
159 Hz.
What is the initial power being radiated?
What do you know?
The initial power will be the initial stored energy one half C Vsquared, divided by
the energy decay time or
10
10
10
10
2
5
8
12
2
CV
P
W.
a)
10 W;
b)
1 W;
c)
1 mW;
d)
10 kW;
e)
1
W.
Problem 20
(like 24.46): The polarization angles in stack of 9 perfect polarizing sheets are each set 10
O
from the previous one to make a device for rotating the polarization by 90
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 09/23/2010 for the course PH 02c taught by Professor Mile during the Spring '04 term at Riverside Community College.
 Spring '04
 mile
 Capacitance, Inductance, Energy

Click to edit the document details