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diff --git a/Engineering_Physics_by_Shyam_Rajeev/Chapter12.ipynb b/Engineering_Physics_by_Shyam_Rajeev/Chapter12.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:85ef8262dd8d094957ce6eda00a743c757c0eaabccf750168045359d519c0a4b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "12: Superconductivity"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 12.1, Page number 294"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "Tc = 9.2;        #critical temperature of metal(K)\n",
+      "Bc = 1.05*10**5;        #magnetic field(amp/m)\n",
+      "B0 = 1.5*10**5;         #critical field(amp/m)\n",
+      "\n",
+      "#Calculation\n",
+      "T = math.sqrt((Tc**2)*(1-(Bc/B0)));        #temperature of metal(K)\n",
+      "T = math.ceil(T*10**4)/10**4;   #rounding off to 4 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"temperature of the metal is\",T,\"K\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "temperature of the metal is 5.0391 K\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 12.2, Page number 295"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "Tc1 = 4.185;        #critical temperature of Hg(K)\n",
+      "M1 = 199.5;         #isotopic mass(gm)\n",
+      "M2 = 203.4;         #changed isotopic mass(gm)\n",
+      "\n",
+      "#Calculation\n",
+      "Tc2 = Tc1*math.sqrt(M1/M2);       #changed critical temperature(K)\n",
+      "Tc2 = math.ceil(Tc2*10**3)/10**3;   #rounding off to 3 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"changed critical temperature of Hg is\",Tc2,\"K\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "changed critical temperature of Hg is 4.145 K\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file