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diff --git a/Engineering_Physics/Chapter9.ipynb b/Engineering_Physics/Chapter9.ipynb
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-{
- "metadata": {
-  "name": "Chapter9"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": "9: Superconducting Materials"
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example number 9.1, Page number 255"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "#importing modules\nimport math\n\n#Variable declaration\nH0 = 6.5*10**4;         #magnetic field intensity(A/m)\nT = 4.2;                #temperature(K)\nTc = 7.18;              #critical temperature(K)\n\n#Calculation\nHc = H0*(1-((T**2)/(Tc**2)));        #critical magnetic field intensity(A/m)\nHc = Hc*10**-4;\nHc=math.ceil(Hc*10**3)/10**3;   #rounding off to 3 decimals\n\n#Result\nprint \"critical magnetic field intensity is\",Hc,\"*10**4 A/m\"",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "critical magnetic field intensity is 4.276 *10**4 A/m\n"
-      }
-     ],
-     "prompt_number": 1
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example number 9.2, Page number 255"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "#importing modules\nimport math\n\n#Variable declaration\nTc1 = 4.185;                #critical temperature for M1(K)\nTc2 = 4.133;                #critical temperature for M2(K)\nM1 = 199.5;                 #isotopic mass\nalpha = 0.5;\n\n#Calculation\nA = math.pow(M1,alpha)*Tc1/Tc2;\nM2 = math.pow(A,1/alpha);       #isotopic mass\nM2=math.ceil(M2*10**3)/10**3;   #rounding off to 3 decimals\n\n#Result\nprint \"isotopic mass is\",M2\nprint \"answer given in the book is wrong\"",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "isotopic mass is 204.552\nanswer given in the book is wrong\n"
-      }
-     ],
-     "prompt_number": 2
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
\ No newline at end of file