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diff --git a/backup/Modern_Physics_By_G.Aruldas_version_backup/Chapter14.ipynb b/backup/Modern_Physics_By_G.Aruldas_version_backup/Chapter14.ipynb
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@@ -1,107 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:f383b09bed78232b6f6bef91df71b6fd8febd00a3f89287a33c756d53748eb03"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "14: Superconductivity"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 14.1, Page number 272"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#importing modules\n",
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#Variable declaration\n",
-      "Bc0=0.0305;    #critical field(T)\n",
-      "T=2;   #temperature(K)\n",
-      "Tc=3.722;   #critical temperature(K)\n",
-      "r=2*10**-3;  #diameter(m)\n",
-      "mew0=4*math.pi*10**-7;   #magnetic permeability\n",
-      "\n",
-      "#Calculation\n",
-      "BcT=Bc0*(1-(T/Tc)**2);   #critical field(T)\n",
-      "Ic=2*math.pi*r*BcT/mew0;   #current(A)\n",
-      "\n",
-      "#Result\n",
-      "print \"current is\",round(Ic,1),\"A\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "current is 216.9 A\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 14.2, Page number 274"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#importing modules\n",
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#Variable declaration\n",
-      "lamda0=37;   #london penetration depth(nm)\n",
-      "T=5.2;    #temperature(K)\n",
-      "Tc=7.193;   #critical temperature(K)\n",
-      "\n",
-      "#Calculation\n",
-      "a=1-(T/Tc)**4;\n",
-      "lamdaT=lamda0*(a**(-1/2));   #penetration depth of lead(nm)\n",
-      "\n",
-      "#Result\n",
-      "print \"penetration depth of lead is\",round(lamdaT,3),\"nm\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "penetration depth of lead is 43.398 nm\n"
-       ]
-      }
-     ],
-     "prompt_number": 7
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file