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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:7c85091bd4e24d60bc3e76c728778479287ddcc4fa6749b5ce2d1adbd2e10621"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "8: Maxwell's equations"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.1, Page number 234"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "K=4.3;     #dielectric constant\n",
+      "c=3*10**8;   #velocity of light in vacuum\n",
+      "\n",
+      "#Calculation\n",
+      "n=round(math.sqrt(K),2);    #refractive index of quartz\n",
+      "v=c/n;    #velocity of light in quartz(m/s)\n",
+      "\n",
+      "#Result\n",
+      "print \"refractive index of quartz is\",n\n",
+      "print \"velocity of light in quartz is\",round(v/10**8,2),\"*10**8 m/s\"\n",
+      "print \"answer for velocity given in the book is wrong\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "refractive index of quartz is 2.07\n",
+        "velocity of light in quartz is 1.45 *10**8 m/s\n",
+        "answer for velocity given in the book is wrong\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.2, Page number 235"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "epsilon0=8.87*10**-12;   #dielectric permittivity of free space\n",
+      "E=1.2*10**6;     #electric field intensity(N/C)\n",
+      "\n",
+      "#Calculation\n",
+      "Ed=(1/2)*epsilon0*(E**2);     #energy density(J/m**2)\n",
+      "\n",
+      "#Result\n",
+      "print \"energy density is\",round(Ed,3),\"J/m**2\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "energy density is 6.386 J/m**2\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.3, Page number 235"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "E0=3*10**6;    #dielectric voltage(V/m)\n",
+      "c=3*10**8;   #velocity of light in vacuum\n",
+      "mew0=4*math.pi*10**-7;   \n",
+      "\n",
+      "#Calculation\n",
+      "Av=(E0**2)/(2*c*mew0);    #average value of Poynting vector(W/m**2)\n",
+      "\n",
+      "#Result\n",
+      "print \"average value of Poynting vector is\",round(Av/10**11,2),\"*10**11 W/m**2\"\n",
+      "print \"answer given in the book is wrong\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "average value of Poynting vector is 0.12 *10**11 W/m**2\n",
+        "answer given in the book is wrong\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file