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diff --git a/Modern_physics_for_engineers_by_S.P.Taneja/chapter24.ipynb b/Modern_physics_for_engineers_by_S.P.Taneja/chapter24.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:b4c2ad3d2231e003dd81c8536584a68dd7b730bbf60d4fc7279f9c5e2add3106"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 24 Superconductivity"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 24.1 Page no 289"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "H1=1.4*10**5                       #A/m\n",
+      "H2=4.2*10**5             \n",
+      "T1=14                              #K\n",
+      "T2=13\n",
+      "Tc=14.5\n",
+      "H0=20.66*10**5                        #A/m\n",
+      "T=4.2\n",
+      "\n",
+      "#Calculation\n",
+      "Hc=H0*(Tc**2-T**2)/Tc**2\n",
+      "\n",
+      "#Result\n",
+      "print\"Critical field is\",round(Hc*10**-5,1),\"*10**5 A/m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical field is 18.9 *10**5 A/m\n"
+       ]
+      }
+     ],
+     "prompt_number": 36
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 24.2 Page no 290"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "Tc1=4.185                          #K\n",
+      "M1=199.5\n",
+      "M2=203.4\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "Tc2=Tc1*math.sqrt(M1)/math.sqrt(M2)\n",
+      "\n",
+      "#Result\n",
+      "print\"Critical temperature is\",round(Tc2,2),\"K\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical temperature is 4.14 K\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 24.3 Page no 290"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "T=4.2                           #K\n",
+      "H0=6.5*10**4                      #A/m\n",
+      "Tc=7.18\n",
+      "d=10**-3\n",
+      "\n",
+      "#Calculation\n",
+      "Hc=H0*(Tc**2-T**2)/Tc**2\n",
+      "Jc=4*Hc/d\n",
+      "\n",
+      "#Result\n",
+      "print\"Critical current is\", round(Jc*10**-8,3),\"*10**8 A/m**2\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical current is 1.71 *10**8 A/m**2\n"
+       ]
+      }
+     ],
+     "prompt_number": 26
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 24.4 Page no 291"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "w=750                         #A\n",
+      "T=3.5\n",
+      "Tc=4.12\n",
+      "h=6.02*10**26\n",
+      "a=13.55*10**3\n",
+      "M=200.6\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "W=w*math.sqrt(1-(T/Tc)**4)\n",
+      "n0=h*a/M\n",
+      "ns=n0*(1-(T/Tc)**4)\n",
+      "\n",
+      "#Result\n",
+      "print\"Penetration is\", round(ns*10**-28,2)*10**28,\"/m**3\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Penetration is 1.95e+28 /m**3\n"
+       ]
+      }
+     ],
+     "prompt_number": 35
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file