Chapter 21: Elecromagnetics

Ex21.1:pg-1037

In [1]:
  #Example 21_1
import math 
  
  #To find the wavelength of the electromagnetic wave
v=3*10.0**8        #Units in meters/sec
f=1.02*10**6         #Units in Hz
lamda=v/f     #Units in Meters
print "The Wavelength of the Electromagnetic wave is lamda=",round(lamda)," meters"

The Wavelength of the Electromagnetic wave is lamda= 294.0  meters

Ex21.2:pg-1038

In [2]:
  #Example 21_2
import math 
  
  #To find the value of magnetic field
eo=4.2*10**-3     #units in V/m
c=3*10**8            #Units in meters/sec
bo=eo/c         #Units in T
print "The value of the magnetic field is Bo="
print bo
print "T"

The value of the magnetic field is Bo=
1.4e-11
T

Ex21.3:pg-1039

In [3]:
  #Example 21_3
import math 
  #To find the values of Eo and Bo in the wave
power=1000         #Units in W
r=10000         #units in meters
area=4*math.pi*r**2        #units in meter**2
P_a=power/area          #unts in W/meter**2
c=3*10**8         #units in meters/sec
eeo=8.85*10**-12       #units in C**2/N*meter**2",round( ,5)," 
eo=math.sqrt((2*P_a)/(c*eeo))             #units in N/C
bo=eo/c          #Units in T
print "The value of Eo=",round(eo,5)," N/C\n The value of Bo=",
print bo
print "T"

The value of Eo= 0.02448  N/C
 The value of Bo= 8.16124749653e-11
T