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diff --git a/Applied_Physics_II_by_H_J_Sawant/Chapter_7.ipynb b/Applied_Physics_II_by_H_J_Sawant/Chapter_7.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 7: Superconductivity"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.3.1, Page number 7-6"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "Ho = 2.*10**5   #A/m\n",
+      "Hc = 1.*10**5   #A/m\n",
+      "T = 8.          #temperature(K)\n",
+      "\n",
+      "#Calculations\n",
+      "Tc = math.sqrt(T**2/(1-(Hc/Ho)))\n",
+      "\n",
+      "#Result\n",
+      "print \"Critical temperature =\",round(Tc,3),\"K\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical temperature = 11.314 K\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.3.2, Page number 7-7"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "Bo = 0.0306   #Critical field at 0K(T)\n",
+      "Tc = 3.7      #critical temperature(K)\n",
+      "T = 2         #K\n",
+      "\n",
+      "#calculation\n",
+      "Bc = Bo*(1-((T/Tc)**2))\n",
+      "\n",
+      "#Result\n",
+      "print \"Critical field at 2K is\",round(Bc,5),\"T\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical field at 2K is 0.02166 T\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.3.3, Page number 7-7"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "Ho = 6.5*10**4   #Critical field at 0K(T)\n",
+      "Tc = 7.18        #critical temperature(K)\n",
+      "T = 4.2          #K\n",
+      "r = 0.5*10**-3   #radius(m)\n",
+      "\n",
+      "#calculation\n",
+      "Hc = Ho*(1-((T/Tc)**2))\n",
+      "Ic = 2*math.pi*r*Hc\n",
+      "\n",
+      "#Result\n",
+      "print \"Critical current =\",round(Ic,2),\"A\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical current = 134.33 A\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.3.4, Page number 7-8"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "#Variable declaration\n",
+      "Tc1 = 4.185      #critical temperature(K)\n",
+      "M1 = 199.5       #isotopic mass\n",
+      "Tc2 = 4.133      #K\n",
+      "\n",
+      "#calculation\n",
+      "M2 = ((Tc1*M1**0.5)/Tc2)**2\n",
+      "\n",
+      "#Result\n",
+      "print \"Isotopic mass =\",round(M2,2)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Isotopic mass = 204.55\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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