From db0855dbeb41ecb8a51dde8587d43e5d7e83620f Mon Sep 17 00:00:00 2001 From: Thomas Stephen Lee Date: Fri, 28 Aug 2015 16:53:23 +0530 Subject: add books --- .../Chapter7_1.ipynb | 442 +++++++++++++++++++++ 1 file changed, 442 insertions(+) create mode 100644 Engineering_Physics_by_S._Mani_Naidu/Chapter7_1.ipynb (limited to 'Engineering_Physics_by_S._Mani_Naidu/Chapter7_1.ipynb') diff --git a/Engineering_Physics_by_S._Mani_Naidu/Chapter7_1.ipynb b/Engineering_Physics_by_S._Mani_Naidu/Chapter7_1.ipynb new file mode 100644 index 00000000..da805b46 --- /dev/null +++ b/Engineering_Physics_by_S._Mani_Naidu/Chapter7_1.ipynb @@ -0,0 +1,442 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "#7: Magnetic properties" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.1, Page number 7.22" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "flux density is 0.628 Wb/m**2\n", + "magnetic moment is -2.0 A/m\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "chi=-0.4*10**-5; #magnetic susceptibility\n", + "H=5*10**5; #magnetic field(A/m)\n", + "mew0=4*math.pi*10**-7; \n", + "\n", + "#Calculation\n", + "B=mew0*H*(1+chi); #flux density(Wb/m**2)\n", + "M=chi*H; #magnetic moment(A/m)\n", + "\n", + "#Result\n", + "print \"flux density is\",round(B,3),\"Wb/m**2\"\n", + "print \"magnetic moment is\",M,\"A/m\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.2, Page number 7.22" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "magnetisation is -0.25 *10**-2 A/m\n", + "flux density is 1.257 *10**-3 Wb/m**2\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "chi=-0.25*10**-5; #magnetic susceptibility\n", + "H=1000; #magnetic field(A/m)\n", + "mew0=4*math.pi*10**-7; \n", + "\n", + "#Calculation\n", + "M=chi*H; #magnetisation(A/m)\n", + "B=mew0*(H+M); #flux density(Wb/m**2)\n", + "\n", + "#Result\n", + "print \"magnetisation is\",M*10**2,\"*10**-2 A/m\"\n", + "print \"flux density is\",round(B*10**3,3),\"*10**-3 Wb/m**2\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.3, Page number 7.23" + ] + }, + { + "cell_type": "code", + "execution_count": 8, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "magnetisation is 3500 A/m\n", + "flux density is 4.71 *10**-3 Wb/m**2\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "H=250; #magnetic field(A/m)\n", + "mewr=15; #relative permeability\n", + "mew0=4*math.pi*10**-7; \n", + "\n", + "#Calculation\n", + "M=H*(mewr-1); #magnetisation(A/m)\n", + "B=mew0*(H+M); #flux density(Wb/m**2)\n", + "\n", + "#Result\n", + "print \"magnetisation is\",M,\"A/m\"\n", + "print \"flux density is\",round(B*10**3,2),\"*10**-3 Wb/m**2\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.4, Page number 7.23" + ] + }, + { + "cell_type": "code", + "execution_count": 10, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "magnetisation is -0.42 A/m\n", + "flux density is 1.256 *10**-3 Wb/m**2\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "chi=-0.42*10**-3; #magnetic susceptibility\n", + "H=1000; #magnetic field(A/m)\n", + "mew0=4*math.pi*10**-7; \n", + "\n", + "#Calculation\n", + "M=chi*H; #magnetisation(A/m)\n", + "B=mew0*(H+M); #flux density(Wb/m**2)\n", + "\n", + "#Result\n", + "print \"magnetisation is\",M,\"A/m\"\n", + "print \"flux density is\",round(B*10**3,3),\"*10**-3 Wb/m**2\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.5, Page number 7.23" + ] + }, + { + "cell_type": "code", + "execution_count": 13, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "magnetic moment is 3.93 *10**-3 Am**2\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "r=10/2; #radius(cm)\n", + "i=500*10**-3; #current(A)\n", + "\n", + "#Calculation\n", + "mew=math.pi*(r*10**-2)**2*i; #magnetic moment(Am**2)\n", + "\n", + "#Result\n", + "print \"magnetic moment is\",round(mew*10**3,2),\"*10**-3 Am**2\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.6, Page number 7.23" + ] + }, + { + "cell_type": "code", + "execution_count": 16, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "magnetizing force is 201 A/m\n", + "relative permeability is 17.4\n", + "answer varies due to rounding off errors\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "mew0=4*math.pi*10**-7; \n", + "B=0.0044; #flux density(Wb/m**2)\n", + "M=3300; #magnetic moment(A/m)\n", + "\n", + "#Calculation\n", + "H=(B/mew0)-M; #magnetizing force(A/m)\n", + "mewr=1+(M/H); #relative permeability\n", + "\n", + "#Result\n", + "print \"magnetizing force is\",int(H),\"A/m\"\n", + "print \"relative permeability is\",round(mewr,1)\n", + "print \"answer varies due to rounding off errors\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.7, Page number 7.24" + ] + }, + { + "cell_type": "code", + "execution_count": 20, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "change in magnetic moment is 5.705 *10**-29 Am**2\n", + "answer given in the book is wrong\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "r=0.052*10**-9; #radius(m)\n", + "B=3; #flux density(Wb/m**2)\n", + "e=1.6*10**-19; \n", + "m=9.1*10**-31; #mass(kg)\n", + "\n", + "#Calculation\n", + "delta_mew=e**2*r**2*B/(4*m); #change in magnetic moment(A m**2)\n", + "\n", + "#Result\n", + "print \"change in magnetic moment is\",round(delta_mew*10**29,3),\"*10**-29 Am**2\"\n", + "print \"answer given in the book is wrong\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.8, Page number 7.24" + ] + }, + { + "cell_type": "code", + "execution_count": 24, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "change in magnetic moment is 3.936 *10**-29 Am**2\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "r=5.29*10**-11; #radius(m)\n", + "B=2; #flux density(Wb/m**2)\n", + "e=1.6*10**-19; \n", + "m=9.1*10**-31; #mass(kg)\n", + "\n", + "#Calculation\n", + "d_mew=e**2*r**2*B/(4*m); #change in magnetic moment(A m**2)\n", + "\n", + "#Result\n", + "print \"change in magnetic moment is\",round(d_mew*10**29,3),\"*10**-29 Am**2\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.9, Page number 7.24" + ] + }, + { + "cell_type": "code", + "execution_count": 27, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "susceptibility is 3.267 *10**-4\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "N=10**28; #number of atoms(per m**3)\n", + "chi1=2.8*10**-4; #susceptibility\n", + "T1=350; #temperature(K)\n", + "T2=300; #temperature(K)\n", + "\n", + "#Calculation\n", + "chi2=chi1*T1/T2; #susceptibility\n", + "\n", + "#Result\n", + "print \"susceptibility is\",round(chi2*10**4,3),\"*10**-4\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "##Example number 7.10, Page number 7.25" + ] + }, + { + "cell_type": "code", + "execution_count": 30, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "relative permeability is 2153.85\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration\n", + "B=1.4; #flux density(Wb/m**2)\n", + "B0=6.5*10**-4; #magnetic field(Tesla)\n", + "\n", + "#Calculation\n", + "mewr=B/B0; #relative permeability\n", + "\n", + "#Result\n", + "print \"relative permeability is\",round(mewr,2)" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.9" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} -- cgit