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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:ab6a6bb45b4cdef5c73ac14b797742c1b4b21056356723e765f29cef6d5d7ccd"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter22-Superconductivity"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg646"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 22.1\n",
+      "##calculation of magnetic field\n",
+      "\n",
+      "##given values\n",
+      "\n",
+      "Tc=7.2;##transition temp in K\n",
+      "T=5.;##temp in K\n",
+      "Hc=3.3*10**4;##magnetic field at T in A/m\n",
+      "\n",
+      "\n",
+      "##calculation\n",
+      "Hc0=Hc/(1-(T**2/Tc**2));\n",
+      "print'%s %.2f %s'%('max value of H at 0K (in A/m) is ',Hc0,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "max value of H at 0K (in A/m) is  63737.70 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg646"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 22.2\n",
+      "##calculation of transition temperature\n",
+      "\n",
+      "##given values\n",
+      "\n",
+      "T=8.;##temp in K\n",
+      "Hc=1*10**5.;##critical magnetic field at T in A/m\n",
+      "Hc0=2*10**5.;##magnetic field at 0 K in A/m\n",
+      "\n",
+      "##calculation\n",
+      "Tc=T/(math.sqrt(1.-Hc/Hc0));\n",
+      "print'%s %.2f %s'%('transition temp in K is',Tc,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "transition temp in K is 11.31 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg647"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 22.3\n",
+      "##calculation of temp at which there is  max critical field\n",
+      "\n",
+      "##given values\n",
+      "\n",
+      "Tc=7.26;##critical temp in K\n",
+      "Hc=8*10**5.;##max critical magnetic field at T in A/m\n",
+      "H=4*10**4.;## subjected magnetic field at in A/m\n",
+      "\n",
+      "##calculation\n",
+      "T=Tc*(math.sqrt(1.-H/Hc));\n",
+      "print'%s %.2f %s'%('max temp for superconductivity in K is',T,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "max temp for superconductivity in K is 7.08 \n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file