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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 20: Super Conducting Materials"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.2, page no-568"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Critical field\n",
+      "\n",
+      "import math\n",
+      "#variable declaration\n",
+      "h0=0.0306                   # critical field\n",
+      "t1=2.0                      # Temperature \n",
+      "t2=3.7                      # Temperature corresponds to h0\n",
+      "\n",
+      "#calculation\n",
+      "he=h0*(1-((t1**2)/t2**2))\n",
+      "\n",
+      "#Result\n",
+      "print(\"The critical field at %d K is %.5f T\"%(t1,he))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The critical field at 2 K is 0.02166 T\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.3, page no-569"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Critical current for a wire\n",
+      "\n",
+      "import math\n",
+      "#variable declaration\n",
+      "t1=4.2                      # Temperature \n",
+      "t2=7.18                     # critical Temperature\n",
+      "h0=6.5*10**4                # critical magnetic field\n",
+      "\n",
+      "#calculations\n",
+      "he=h0*(1-((t1**2)/t2**2)) \n",
+      "r=0.5*10**-3\n",
+      "I=2*3.14*he*r\n",
+      "\n",
+      "#Result\n",
+      "print(\"The critical current through a wire of lead is %.2f A\"%I)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The critical current through a wire of lead is 134.26 A\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.4, page no-570"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#critical temperature\n",
+      "\n",
+      "import math\n",
+      "#variable declaration\n",
+      "tc1=4.185                 # Critical temperature of lead\n",
+      "m1=199.5                  # isotopic mass 1\n",
+      "m2=203.4                  # isotopic mass 2\n",
+      "\n",
+      "#calculation\n",
+      "tc2=tc1* math.sqrt(m1/m2)\n",
+      "\n",
+      "#Result\n",
+      "print(\"The critical temperature for metal with isotopic mass of %.1f is %.3f K\"%(m2,tc2))\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The critical temperature for metal with isotopic mass of 203.4 is 4.145 K\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file