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diff --git a/Electrical_Power-i__by_M.L._Anand/Chapter9.ipynb b/Electrical_Power-i__by_M.L._Anand/Chapter9.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter9 - Substations and earthing"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Problem 9.1 - page 252"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from numpy import pi\n",
+      "#Given Data :\n",
+      "V=250 #in volt\n",
+      "f=50 #in Hz\n",
+      "l=300 #in km\n",
+      "C_earth=0.03 #in uF\n",
+      "C=l*C_earth*10**-6 #in F\n",
+      "XL=1/(3*2*pi*f*C) #in ohm\n",
+      "print \"Reactance required for the Peterson coil = %.f ohm\" %XL"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reactance required for the Peterson coil = 118 ohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}