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@@ -1,101 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:54e553aa602b5b46f788e4b29d82727b714210cbc37d72a1b8625b974bd8b58b"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter13:SUPERCONDUCTIVITY"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "\n",
-      "Ex13.1:pg-357"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#example 1\n",
-      "#to calculate value of Temperature\n",
-      "import math\n",
-      "Bc=105.0*10**3 #magnetic field in amp/m\n",
-      "Bo=150.0*10**3 #critical field of the metal in amp/m \n",
-      "Tc=9.2 #critical temperature of the metal in K\n",
-      "T=Tc*math.sqrt(1-(Bc/Bo))#temperature\n",
-      "print\"\\n the value of temperature is\",round(T,3),\"K\"\n",
-      "\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "\n",
-        " the value of temperature is 5.039 K\n"
-       ]
-      }
-     ],
-     "prompt_number": 9
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex13.2:pg-357"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#example 2\n",
-      "#to calculate temperature\n",
-      "import math\n",
-      "Tc=7.18 #critical temperature in K\n",
-      "Bc=4.5*10**3  #critical field in A/m\n",
-      "Bo=6.5*10**3 #critical magnetic field in A/m\n",
-      "T=Tc*math.sqrt(1-(Bc/Bo))# temperature\n",
-      "print\"\\n the temperature is\",round(T,2),\"K\"\n",
-      "#to calculate critical current density at that temperature\n",
-      "r=1*10**-3 #diameter of the wire in mm\n",
-      "TJc=(Bc*2*math.pi*r)/(math.pi*r**2)# critical current density\n",
-      "print\"\\n the critical current density at that temperature is\",\"{:.1e}\".format(TJc),\"A/m^2\"\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "\n",
-        " the temperature is 3.98 K\n",
-        "\n",
-        " the critical current density at that temperature is 9.0e+06 A/m^2\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file