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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 14 : Conductors and Resistors"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 14.1, Page No 336"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#initialisation of variables\n",
+      "n_x1 = 1.0  # atomic level\n",
+      "n_y1 = 1.0  # atomic level\n",
+      "n_z1 = 1.0  # atomic level\n",
+      "n_x2 = 2.0  # atomic level\n",
+      "L = 10.0    # lattice parameter in mm\n",
+      "h = 6.626e-34 # plank constant\n",
+      "m_e = 9.109e-31 # mass of electron in kg\n",
+      "\n",
+      "#Calculations\n",
+      "E1 = h**2*(n_x1**2+n_y1**2+n_z1**2)/(8*m_e*(L*1e-3)**2)\n",
+      "E2 = h**2*(n_x2**2+n_y1**2+n_z1**2)/(8*m_e*(L*1e-3)**2)\n",
+      "E = E2-E1 # energy difference \n",
+      "\n",
+      "#Results\n",
+      "print(\"Energy difference is %.2e J \" %E)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Energy difference is 1.81e-33 J \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 14.2, Page No 340"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#initialisation of variables\n",
+      "tau = 2e-14 # collision time of electron in s\n",
+      "e = 1.602e-19 # charge on electron\n",
+      "m_e = 9.1e-31 # mass of electron in kg\n",
+      "\n",
+      "#Calculations\n",
+      "n = 6.023e23*8960/0.06354\n",
+      "sigma= n*e**2*tau/m_e\n",
+      "\n",
+      "#Results\n",
+      "print(\"Conductivity of copper at 300 K is %.1e ohm^-1 m^-1 \" %sigma)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Conductivity of copper at 300 K is 4.8e+07 ohm^-1 m^-1 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 14.3, Page No 341"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#initialisation of variables\n",
+      "r_cu = 1.8e-8 \t\t# resistivity of pure copper in ohm-m\n",
+      "r_Ni_cu = 7e-8 \t\t#resistivity of copper 4% Ni in ohm-m\n",
+      "per1 = 4.0\t\t\t#impurity in percent\n",
+      "per2 = 1.0\t\t\t # impurity in percent\n",
+      "\n",
+      "#Calculations\n",
+      "r = (r_Ni_cu-r_cu)*per2/per1 \t# resistivity of copper 1% Ni in ohm-m\n",
+      "\n",
+      "#Results\n",
+      "print(\"Resistivity due to impurity scattering of 1 %% of Nickel in copper lattice is %.1e ohm-m\" %r)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Resistivity due to impurity scattering of 1 % of Nickel in copper lattice is 1.3e-08 ohm-m\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file