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{
"metadata": {
"name": "",
"signature": "sha256:4bb25a18af878dce815ea6fd0470757443fe2ad8404e54fa1bb8e38dd97cd417"
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"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"11: Electrostatics and electromagnetic theory"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.1, Page number 279"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"mew = 1; #parameter of aluminium\n",
"sigma = 3.54*10**7; #conductivity(mho/m)\n",
"delta = 0.01*10**-3; #skin depth of aluminium(mm)\n",
"\n",
"#Calculation\n",
"new = 1/((delta**2)*math.pi*mew*sigma); #frequency(Hz)\n",
"new = math.ceil(new*10**2)/10**2; #rounding off to 2 decimals\n",
"\n",
"#Result\n",
"print \"frequency is\",new,\"Hz\"\n",
"print \"answer given in the book is wrong\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"frequency is 89.92 Hz\n",
"answer given in the book is wrong\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.2, Page number 280"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"se = 2; #solar energy(cal /min /cm**2)\n",
"j = (4.2*10**4)/60; #conversion factor from cal /min /cm**2 to J /m**2 /sec)\n",
"mew0 = 4*math.pi*10**-7; #permeability of free space(H/m)\n",
"epsilon0 = 8.854*10**-12; #permittivity of free space(F/m)\n",
"\n",
"#Calculation\n",
"EH = se*j; #solar energy(J /m**2 /sec)\n",
"EbyH = math.sqrt(mew0/epsilon0);\n",
"EbyH = math.ceil(EbyH*10)/10; #rounding off to 1 decimal\n",
"H = math.sqrt(EH/EbyH); #magnetic field of radiation\n",
"E = EbyH*H;\n",
"H = math.ceil(H*10**3)/10**3; #rounding off to 3 decimals\n",
"E = math.ceil(E*10)/10; #rounding off to 1 decimal\n",
"E0 = E*math.sqrt(2); #electric field of radiation(volt/m)\n",
"H0 = H*math.sqrt(2); #magnetic field of radiation (amp-turn/m)\n",
"H0 = math.ceil(H0*10**2)/10**2; #rounding off to 2 decimals\n",
"\n",
"#Result\n",
"print \"electric field of radiation is\",int(E0),\"volt/m\"\n",
"print \"magnetic field of radiation is\",H0,\"amp-turn/m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"electric field of radiation is 1027 volt/m\n",
"magnetic field of radiation is 2.73 amp-turn/m\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.3, Page number 280"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"p = 4.3*10**-8; #polarization(C/m**2)\n",
"E = 1000; #electric field(V/m)\n",
"epsilon0 = 8.85*10**-12; #permittivity of free space(F/m)\n",
"\n",
"#Calculation\n",
"epsilonr = 1+(p/(epsilon0*E)); #relative permittivity\n",
"epsilonr = math.ceil(epsilonr*10**2)/10**2; #rounding off to 2 decimals\n",
"\n",
"#Result\n",
"print \"relative permittivity is\",epsilonr"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"relative permittivity is 5.86\n"
]
}
],
"prompt_number": 16
}
],
"metadata": {}
}
]
}
|
