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diff --git a/backup/Materials_Science_version_backup/Chapter17.ipynb b/backup/Materials_Science_version_backup/Chapter17.ipynb
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@@ -0,0 +1,60 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:03648571a8c8e1b4e8f8e6dad5bff5a090472aa9ccf6236105c75aa2a594a7be"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter17:Insulating Materials"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex17.1:pg-333"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Example 17.1: greater chanrge\n",
+      " \n",
+      "\n",
+      "er1=6;#\n",
+      "d1=0.25;# in mm\n",
+      "a=1;# assume\n",
+      "er2=2.6;#\n",
+      "d2=0.1;# in mm\n",
+      "c1=(er1/d1);# in ampere\n",
+      "c2=(er2/d2);# in amperes\n",
+      "print\" C1 \",c1,\"A will hold the more charge than C2 \",c2,\"A \"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " C1  24.0 A will hold the more charge than C2  26.0 A \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file