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diff --git a/Engineering_Physics_by_Shyam_Singh_and_Rajeev_Singh/Chapter9.ipynb b/Engineering_Physics_by_Shyam_Singh_and_Rajeev_Singh/Chapter9.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:e8e761ea4c766f0a738732d4994726c98969966c5d35a3277656198f5c5939ee"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "9: Dielectrics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 9.1, Page number 223"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "p = 4.3*10**-8;         #polarization(C/m**2)\n",
+      "E = 1000;         #electric field(V/m)\n",
+      "epsilon_0 = 8.85*10**-12;      #permittivity of free space(F/m)\n",
+      "\n",
+      "#Calculation\n",
+      "epsilon_r = 1+(p/(epsilon_0*E));         #relative permittivity\n",
+      "epsilon_r = math.ceil(epsilon_r*10**2)/10**2;   #rounding off to 2 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"relative permittivity is\",epsilon_r"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "relative permittivity is 5.86\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file