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-{

- "metadata": {

-  "name": "",

-  "signature": "sha256:aecad4e644a378cab0352aa29e9045a53c52646739e4f4bd6cdff80f1d0741e6"

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "Chapter 8:Magnetic Properties"

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.1 , Page no:236"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "X=-0.5E-5; #magnetic susceptibility of silicon\n",

-      "H=0.9E4; #in A/m (magnetic field intensity)\n",

-      "mu0=4*3.14*1E-7; #in H/m (absolute permeability)\n",

-      "\n",

-      "#calculate\n",

-      "I=X*H; #calculation of intensity of magnetism\n",

-      "B=mu0*H*(1+X); #calculation of magnetic flux density\n",

-      "\n",

-      "#result\n",

-      "print\"The intensity of magnetism is I=\",I,\"A/m\";\n",

-      "print\"The magnetic flux density is B=\",round(B,3),\"Wb/m^2\";\n",

-      "print \"NOTE: The answer in the textbook is wrong\" "

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The intensity of magnetism is I= -0.045 A/m\n",

-        "The magnetic flux density is B= 0.011 Wb/m^2\n",

-        "NOTE: The answer in the textbook is wrong\n"

-       ]

-      }

-     ],

-     "prompt_number": 1

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.2 , Page no:236"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "r=0.052; #in nm (radius of orbit)\n",

-      "B=1; #in Wb/m^2 (magnetic field of induction)\n",

-      "e=1.6E-19; #in C (charge of electron)\n",

-      "m=9.1E-31; #in Kg (mass of electron)\n",

-      "\n",

-      "#calculate\n",

-      "r=0.052*1E-9; #changing unit from nm to m\n",

-      "d_mu=(e**2*r**2*B)/(4*m); #calculation of change in magnetic moment\n",

-      "\n",

-      "#result\n",

-      "print\"The change in magnetic moment is =\",d_mu,\"Am^2\";\n",

-      "print \"NOTE: The answer in the textbook is wrong\" "

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The change in magnetic moment is = 1.90171428571e-29 Am^2\n",

-        "NOTE: The answer in the textbook is wrong\n"

-       ]

-      }

-     ],

-     "prompt_number": 2

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.3 , Page no:236"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "H=220; #in A/m (magnetic field intensity)\n",

-      "I=3300; #in A/m (intensity of magnetisation)\n",

-      "\n",

-      "#calculate\n",

-      "mu_r=1+(I/H); #calculation of relative permeability\n",

-      "\n",

-      "#result\n",

-      "print\"The relative permeability of a ferromagentic material is =\",mu_r;"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The relative permeability of a ferromagentic material is = 16.0\n"

-       ]

-      }

-     ],

-     "prompt_number": 3

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.4 , Page no:236"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "I=3000; #in A/m (intensity of magnetisation)\n",

-      "B=0.005; #in Wb/m^2 (magnetic flus intensity)\n",

-      "pi=3.14; #value of pi used in the solution\n",

-      "mu0=4*pi*1E-7; #in H/m (absolute permeability)\n",

-      "\n",

-      "#calculate\n",

-      "H=(B/mu0)-I; #calculation of magnetic force\n",

-      "mu_r=(I/H)+1; #calculation of relative permeability\n",

-      "\n",

-      "#result\n",

-      "print\"The magnetic force is  H=\",H;\n",

-      "print\"The relative permeability is =\",mu_r;"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The magnetic force is  H= 980.891719745\n",

-        "The relative permeability is = 4.05844155844\n"

-       ]

-      }

-     ],

-     "prompt_number": 4

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.5 , Page no:237"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "H=4E3; #in A/m (magnetic field intensity)\n",

-      "N=60; #number of turns\n",

-      "l=12; #in cm (length of solenoid)\n",

-      "\n",

-      "#calculate\n",

-      "n=N/(l*1E-2); #calculation of number of turns per unit metre\n",

-      "#Snice H=n*i;\n",

-      "i=H/n; #calculation of current through the solenoid\n",

-      "\n",

-      "#result\n",

-      "print\"The current through the solenoid is i=\",i,\"A\";"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The current through the solenoid is i= 8.0 A\n"

-       ]

-      }

-     ],

-     "prompt_number": 5

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.6 , Page no:237"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "l=30; #in cm (length of solenoid)\n",

-      "A=1; #in cm^2 (cross-sectional area)\n",

-      "N=300; #number of turns\n",

-      "i=0.032; #in A (current through the winding)\n",

-      "phi_B=2E-6; #in Wb (magnetic flux)\n",

-      "pi=3.14; #value of pi used in the solution\n",

-      "mu0=4*pi*1E-7; #in H/m (absolute permeability)\n",

-      "\n",

-      "#calculate\n",

-      "l=l*1E-2; #changing unit from cm to m\n",

-      "A=A*1E-4; #changing unit from cm^2 to m^2\n",

-      "B=phi_B/A; #calculation of flux density\n",

-      "H=N*i/l; #calculation of magnetic intensity\n",

-      "mu=B/H; #calcluation of absolute permeability of iron\n",

-      "mu_r=mu/mu0; #calcluation of relative permeability of iron\n",

-      "\n",

-      "#result\n",

-      "print\"The flux density is B=\",B,\"Wb/m^2\";\n",

-      "print\"The magnetic intensity is H=\",H,\"A-turns/m\";\n",

-      "print\"The relative permeability of iron is =\",round(mu_r),\"    (roundoff error)\";\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The flux density is B= 0.02 Wb/m^2\n",

-        "The magnetic intensity is H= 32.0 A-turns/m\n",

-        "The relative permeability of iron is = 498.0     (roundoff error)\n"

-       ]

-      }

-     ],

-     "prompt_number": 6

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.7 , Page no:238"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "from __future__ import division\n",

-      "\n",

-      "#given\n",

-      "A=100; #in m^2 (area of Hysteresis loop)\n",

-      "B=0.01; #in Wb/m^2 (unit space along vertical axis or magnetic flux density)\n",

-      "H=40; #in A/m (unit space along horizontal axis or magnetic fild ntensity)\n",

-      "\n",

-      "#calculate\n",

-      "H_L=A*B*H; #calculation of magnetic intensity\n",

-      "\n",

-      "#result\n",

-      "print\"The Hystersis loss per cycle is =\",round(H_L),\"J/m^2\";"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The Hystersis loss per cycle is = 40.0 J/m^2\n"

-       ]

-      }

-     ],

-     "prompt_number": 7

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
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