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diff --git a/Engineering_Physics_by_Rajendran/Chapter20.ipynb b/Engineering_Physics_by_Rajendran/Chapter20.ipynb new file mode 100755 index 00000000..b3801c22 --- /dev/null +++ b/Engineering_Physics_by_Rajendran/Chapter20.ipynb @@ -0,0 +1,155 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:e20abe68023c39c2fa0cfc7eae20109c8c692466fb3387d83d01339972209a5e"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "20: Magnetic materials"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 20.1, Page number 39"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "M=2300; #magnetisation(A/m)\n",
+ "B=0.00314; #flux density(Wb/m**2)\n",
+ "mew0=4*math.pi*10**-7;\n",
+ "\n",
+ "#Calculation\n",
+ "H=(B/mew0)-M; #magnetizing force(A/m)\n",
+ "mew_r=(M/H)+1; #relative permeability\n",
+ "\n",
+ "#Result\n",
+ "print \"magnetizing force is\",round(H,4),\"A/m\"\n",
+ "print \"relative permeability is\",round(mew_r,5)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "magnetizing force is 198.7326 A/m\n",
+ "relative permeability is 12.57334\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 20.2, Page number 40"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "H=10**4; #magnetic field intensity(A/m)\n",
+ "chi=3.7*10**-3; #susceptibility\n",
+ "mew0=4*math.pi*10**-7;\n",
+ "\n",
+ "#Calculation\n",
+ "M=chi*H; #magnetisation(A/m)\n",
+ "B=mew0*(M+H); #flux density(Wb/m**2)\n",
+ "\n",
+ "#Result\n",
+ "print \"magnetisation is\",M,\"A/m\"\n",
+ "print \"flux density is\",round(B*10**2,2),\"*10**-2 Wb/m**2\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "magnetisation is 37.0 A/m\n",
+ "flux density is 1.26 *10**-2 Wb/m**2\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 20.3, Page number 41"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "a=2.5*10**-10; #interatomic spacing(m)\n",
+ "M=1.8*10**6; #magnetisation(A/m)\n",
+ "n=2; #number of atoms present in unit cell\n",
+ "e=1.6*10**-19; #charge of electron(c)\n",
+ "m=9.1*10**-31; #mass of electron(kg)\n",
+ "h=6.625*10**-34; #planck's constant\n",
+ "\n",
+ "#Calculation\n",
+ "nv=n/(a**3); #number of atoms present per unit volume(per m**3)\n",
+ "Ma=M/nv; #magnetisation produced per atom(A/m**2)\n",
+ "beta=e*h/(4*math.pi*m); #bohr magneton(A/m**2)\n",
+ "Ma=Ma/beta; #magnetisation produced per atom(bohr magneton)\n",
+ "\n",
+ "#Result\n",
+ "print \"average magnetisation produced per atom is\",round(Ma,3),\"bohr magneton\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "average magnetisation produced per atom is 1.517 bohr magneton\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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