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{
"metadata": {
"name": "",
"signature": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 17, Electromagnetic waves"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1, page 550"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from numpy import pi\n",
"# magnitude\n",
"#given data :\n",
"R=7*10**8 # in m\n",
"P=3.8*10**26 # in Watt\n",
"S=P/(4*pi*R**2) \n",
"print \"Magnitude of poynting vector, S = %0.3e W/m^2 \" %S"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Magnitude of poynting vector, S = 6.171e+07 W/m^2 \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2, page 551"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import pi\n",
"# Poynting vector\n",
"#given data :\n",
"R=1.5*10**11 # in m\n",
"P=3.8*10**26 # in Watt\n",
"S=P/(4*pi*R**2) # in W/m**2\n",
"Se=round(S*60/(4.2*10**4)) \n",
"print \"Poynting vector, Se = %0.2f cal/cm^2-m \" %Se"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Poynting vector, Se = 2.00 cal/cm^2-m \n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3, page 560"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import sqrt\n",
"# Amplitude and magnetic field\n",
"#given data :\n",
"S=2 # in cal/cm**2- min\n",
"EH=S*4.2*10**4/60 # joule/m**2 sec\n",
"mu0=4*pi*10**-7 \n",
"epsilon0=8.85*10**-12 \n",
"EbyH=sqrt(mu0/epsilon0) \n",
"E=sqrt(EH*EbyH) \n",
"H=EH/E \n",
"E0=E*sqrt(2) \n",
"H0=H*sqrt(2) \n",
"print \"E = %0.2f V/m \"%E\n",
"print \"H = %0.3f Amp-turn/m \"%H\n",
"print \"Amplitude of electric fields of radiation, E0 = %0.f V/m \" %E0\n",
"print \"Magnetice field of radition, H0 = %0.2f Amp-turn/m \" %H0"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"E = 726.32 V/m \n",
"H = 1.928 Amp-turn/m \n",
"Amplitude of electric fields of radiation, E0 = 1027 V/m \n",
"Magnetice field of radition, H0 = 2.73 Amp-turn/m \n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4, page 560"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import pi\n",
"# electric and magnetic field\n",
"#given data :\n",
"r=2 # in m\n",
"mu0=4*pi*10**-7 \n",
"epsilon0=8.85*10**-12 \n",
"EbyH=sqrt(mu0/epsilon0) \n",
"EH=1000/(4*r**2*pi**2) # in W/m**2\n",
"E=sqrt(EH*EbyH) \n",
"H=(EH/E) \n",
"print \"Intensities of electric, E = %0.2f V/m\" %E\n",
"print \"Magnetic field of radiation, H = %0.4f Amp-turn/m \" %H"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Intensities of electric, E = 48.85 V/m\n",
"Magnetic field of radiation, H = 0.1296 Amp-turn/m \n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5, page 593"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import degrees, pi, asin, sin, tan\n",
"# Degree of polarization\n",
"#given data :\n",
"thetai=45 # in degree\n",
"n=1.5 #/ index\n",
"thetar=asin(sin(thetai*pi/180)/n) # radian\n",
"thetar= degrees(thetar)\n",
"Rl=sin((thetai-thetar)*pi/180)**2/sin((thetai+thetar)*pi/180)**2 \n",
"Rp=tan(thetai-thetar*pi/180)**2/tan((thetai+thetar)*pi/180)**2 \n",
"D=((Rl-Rp)/(Rl+Rp))*100 \n",
"print \"Degree of polarization, D = %0.2f %%\" %D\n",
"# answer is wrong in the textbook"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Degree of polarization, D = 49.44 %\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6, page 594"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Frequency\n",
"#given data :\n",
"Del=1 # in m\n",
"mu=4*pi*10**-7 # in H/m\n",
"sigma=4 # in siemen/m\n",
"v=1*10**-3/(pi*Del**2*mu*sigma) \n",
"print \"Frequency, v = %0.1f kHz \" %v"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Frequency, v = 63.3 kHz \n"
]
}
],
"prompt_number": 16
}
],
"metadata": {}
}
]
}
|
