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diff --git a/Modern_physics_for_engineers_by_S.P.Taneja/chapter23.ipynb b/Modern_physics_for_engineers_by_S.P.Taneja/chapter23.ipynb
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@@ -0,0 +1,93 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:ddc25f5d953d46de15d09c9a8d7da27eb7ecafe874a3fe46bf2bbd376bf4cf37"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 23 Magnetic properties of solids"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 23.1 Page no 268"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "u=9.3*10**-24                   #Joule/tesla\n",
+      "ub=5.6*10**-5                  #ev\n",
+      "Kb=0.025                          #ev\n",
+      "\n",
+      "#Calculation\n",
+      "A=ub/Kb\n",
+      "print\"Magnetic interaction is\", A*10**3,\"*10**-3\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Magnetic interaction is 2.24 *10**-3\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 23.2 Page no 269"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "N=2.8*10**-13\n",
+      "a=27*10**23\n",
+      "b=0.53*10**-8\n",
+      "\n",
+      "#Calculation\n",
+      "x=-(a*N*b)/3.0\n",
+      "\n",
+      "#Result\n",
+      "print\"Diamagnetic susceptibility is\", round(x*10**-4,2),\"*10**-5\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Diamagnetic susceptibility is -0.13 *10**-5\n"
+       ]
+      }
+     ],
+     "prompt_number": 17
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file