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diff --git a/backup/Modern_Physics_By_G.Aruldas_version_backup/Chapter13_2.ipynb b/backup/Modern_Physics_By_G.Aruldas_version_backup/Chapter13_2.ipynb new file mode 100755 index 00000000..70f718e0 --- /dev/null +++ b/backup/Modern_Physics_By_G.Aruldas_version_backup/Chapter13_2.ipynb @@ -0,0 +1,250 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:1e02413599230fcf3193c09944545ea5772a7d8e9a89055fec5a43dcb6e7435b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "13: Magnetic properties of solids"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.1, Page number 256"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "chi=-4.2*10**-6; #magnetic susceptibility\n",
+ "H=1.2*10**5; #magnetic field(A/m)\n",
+ "mew0=4*math.pi*10**-7; #permitivity of free space(H/m)\n",
+ "\n",
+ "#Calculation\n",
+ "M=chi*H; #magnetisation(A/m)\n",
+ "B=mew0*(H+M); #flux density(T)\n",
+ "mewr=(M/H)+1; #relative permeability\n",
+ "\n",
+ "#Result\n",
+ "print \"magnetisation is\",M,\"A/m\"\n",
+ "print \"flux density is\",round(B,3),\"T\"\n",
+ "print \"relative permeability is\",round(mewr,6)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "magnetisation is -0.504 A/m\n",
+ "flux density is 0.151 T\n",
+ "relative permeability is 0.999996\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.2, Page number 258"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Z=2; #atomic number\n",
+ "mew0=4*math.pi*10**-7; #permitivity of free space(H/m)\n",
+ "e=1.6*10**-19; #conversion factor from J to eV\n",
+ "m=9.1*10**-31; #mass of electron(kg)\n",
+ "N=28*10**26; #number of atoms(per m**3)\n",
+ "r=0.6*10**-10; #mean radius(m)\n",
+ "\n",
+ "#Calculation\n",
+ "chi=-mew0*Z*e**2*N*r**2/(6*m); #diamagnetic susceptibility\n",
+ "\n",
+ "#Result\n",
+ "print \"diamagnetic susceptibility is\",round(chi*10**8,3),\"*10**-8\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "diamagnetic susceptibility is -11.878 *10**-8\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.3, Page number 259"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n=2;\n",
+ "a=2.55*10**-10; #lattice constant(m)\n",
+ "chi=5.6*10**-6; #susceptibility\n",
+ "Z=1;\n",
+ "mew0=4*math.pi*10**-7; #permitivity of free space(H/m)\n",
+ "e=1.6*10**-19; #conversion factor from J to eV\n",
+ "m=9.1*10**-31; #mass of electron(kg)\n",
+ "\n",
+ "#Calculation\n",
+ "N=n/(a**3); #number of electrons per unit volume(per m**3)\n",
+ "rbar=math.sqrt(chi*6*m/(mew0*Z*e**2*N)); #radius of atom(m)\n",
+ "\n",
+ "#Result\n",
+ "print \"radius of atom is\",round(rbar*10**10,3),\"angstrom\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "radius of atom is 0.888 angstrom\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.4, Page number 260"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "mew0=4*math.pi*10**-7; #permitivity of free space(H/m)\n",
+ "k=1.38*10**-23; #boltzmann constant(J/K)\n",
+ "T=300; #temperature(K)\n",
+ "N=6.5*10**25; #number of atoms(per m**3)\n",
+ "mew=9.27*10**-24; \n",
+ "\n",
+ "#Calculation\n",
+ "chi=mew0*N*mew**2/(3*k*T); #susceptibility\n",
+ "\n",
+ "#Result\n",
+ "print \"susceptibility is\",round(chi*10**7,2),\"*10**-7\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "susceptibility is 5.65 *10**-7\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.5, Page number 260"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "rho=4370; #density(kg/m**3)\n",
+ "NA=6.02*10**26; #avagadro number(k/mole)\n",
+ "M=168.5; #molecular weight(kg/kmol)\n",
+ "mew0=4*math.pi*10**-7; #permitivity of free space(H/m)\n",
+ "k=1.38*10**-23; #boltzmann constant(J/K)\n",
+ "T=300; #temperature(K)\n",
+ "H=2*10**5; #electric field(A/m)\n",
+ "mew=2*9.27*10**-24; \n",
+ "\n",
+ "#Calculation\n",
+ "N=rho*NA/M; \n",
+ "chi=mew0*N*mew**2/(3*k*T); #susceptibility\n",
+ "M=chi*H; #magnetisation(A/m)\n",
+ "\n",
+ "#Result\n",
+ "print \"susceptibility is\",round(chi*10**4,4),\"*10**-4\"\n",
+ "print \"magnetisation is\",round(M,3),\"A/m\"\n",
+ "print \"answer varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "susceptibility is 5.4298 *10**-4\n",
+ "magnetisation is 108.596 A/m\n",
+ "answer varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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