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diff --git a/Engineering_Physics_by_K._Rajagopal/Chapter_13.ipynb b/Engineering_Physics_by_K._Rajagopal/Chapter_13.ipynb new file mode 100755 index 00000000..2ee7f8d7 --- /dev/null +++ b/Engineering_Physics_by_K._Rajagopal/Chapter_13.ipynb @@ -0,0 +1,216 @@ +{ + "metadata": { + "name": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 13: Magnetic Materials" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 13.1, Page 457" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import pi\n", + "\n", + "#Variable declaration\n", + "u0=4*pi*1e-7;\n", + "H=1e7;#magnetic field strength\n", + "X=(-0.9)*1e-6;#magnetic suseptiblity\n", + "\n", + "#Calculations&Results\n", + "M=X*H;#magnetization of material\n", + "print 'magnetization of material is %.f A/m'%M\n", + "B=u0*H;#magnetic flux density\n", + "print 'magnetic flux density is %.2f Wb/m^2'%B\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "magnetization of material is -9 A/m\n", + "magnetic flux density is 12.57 Wb/m^2\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 13.2, Page 457" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import pi\n", + "\n", + "#Variable declaration\n", + "X=2*1e-3;#magnetic suseptibility of material at room temp.\n", + "H=1e3;#magnetic field intrnsity of piece of ferricoxide\n", + "u0=4*pi*1e-7;\n", + "\n", + "#Calculatons&Results\n", + "M=X*H;#magnetization\n", + "print 'magnetization is %.f A/m'%M\n", + "ur=X+1;#relative permiability\n", + "B=u0*ur*H;#magnetic flux density\n", + "print 'magnetic flux density is %.3f*10^-3 W/m^2'%(B/1e-3)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "magnetization is 2 A/m\n", + "magnetic flux density is 1.259*10^-3 W/m^2\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 13.3, Page 458" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable declaration\n", + "M=2.74*1e8;#magnetization per atom in A/m\n", + "a=2.66*1e-10;#elementry cube edge\n", + "n=2;#Iron in BCC\n", + "\n", + "#Calculations&Results\n", + "B=(M*a**3)/2;#Am^2 per atom\n", + "print 'Average number of Bohr magnetons contributed are %.2f*10^-22'%(B/1e-22)\n", + "#interms of bohr megneton\n", + "b=B/(9.27*1e-24);#dipole moment\n", + "print 'dipole moment is %.f bohr megneton/atom'%b\n", + "#Incorrect answers in the textbook\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Average number of Bohr magnetons contributed are 25.78*10^-22\n", + "dipole moment is 278 bohr megneton/atom\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 13.4, Page 258" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import pi\n", + "\n", + "#Variable declaration\n", + "u0=4*pi*1e-7;\n", + "b=9.27*1e-24;\n", + "H=1e3;#homogeneous field\n", + "k=1.38*1e-23;#boltzmann constant\n", + "T=303;#temp in kelvin\n", + "\n", + "#Calculations\n", + "T1 = T - 273; # Temp In Degree\n", + "x=u0*b*H/(k*T);#avg magnetic moment\n", + "\n", + "#Result\n", + "print 'avg magnetic moment is %.2f*10^-6 bohr magneton/spin'%(x/1e-6)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "avg magnetic moment is 2.79*10^-6 bohr magneton/spin\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 13.5, Page 459" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable declaration\n", + "ur=16;#relative permiability\n", + "I=3300;#intensity of magnetization\n", + "\n", + "#Calculation\n", + "H=I/(ur-1);#strength of the field\n", + "\n", + "#Result\n", + "print 'strength of the field =%.f A/m'%H\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "strength of the field =220 A/m\n" + ] + } + ], + "prompt_number": 5 + } + ], + "metadata": {} + } + ] +}
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