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diff --git a/backup/Principles_of_Physics_by_F.J.Bueche_version_backup/Chapter21.ipynb b/backup/Principles_of_Physics_by_F.J.Bueche_version_backup/Chapter21.ipynb
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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Chapter 21: Elecromagnetics"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## Ex21.1:pg-1037"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "The Wavelength of the Electromagnetic wave is lamda= 294.0  meters\n"
-     ]
-    }
-   ],
-   "source": [
-    "  #Example 21_1\n",
-    " \n",
-    "  \n",
-    "  #To find the wavelength of the electromagnetic wave\n",
-    "v=3*10.0**8        #Units in meters/sec\n",
-    "f=1.02*10**6         #Units in Hz\n",
-    "lamda=v/f     #Units in Meters\n",
-    "print \"The Wavelength of the Electromagnetic wave is lamda=\",round(lamda),\" meters\"\n"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## Ex21.2:pg-1038"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "The value of the magnetic field is Bo=\n",
-      "1.4e-11\n",
-      "T\n"
-     ]
-    }
-   ],
-   "source": [
-    "  #Example 21_2\n",
-    " \n",
-    "  \n",
-    "  #To find the value of magnetic field\n",
-    "eo=4.2*10**-3     #units in V/m\n",
-    "c=3*10**8            #Units in meters/sec\n",
-    "bo=eo/c         #Units in T\n",
-    "print \"The value of the magnetic field is Bo=\"\n",
-    "print bo\n",
-    "print \"T\"\n"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## Ex21.3:pg-1039"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 6,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "The value of Eo= 0.02448  N/C\n",
-      " The value of Bo= 8.16124749653e-11\n",
-      "T\n"
-     ]
-    }
-   ],
-   "source": [
-    "  #Example 21_3\n",
-    "import math \n",
-    "  #To find the values of Eo and Bo in the wave\n",
-    "power=1000         #Units in W\n",
-    "r=10000         #units in meters\n",
-    "area=4*math.pi*r**2        #units in meter**2\n",
-    "P_a=power/area          #unts in W/meter**2\n",
-    "c=3*10**8         #units in meters/sec\n",
-    "eeo=8.85*10**-12       #units in C**2/N*meter**2\",round( ,5),\" \n",
-    "eo=math.sqrt((2*P_a)/(c*eeo))             #units in N/C\n",
-    "bo=eo/c          #Units in T\n",
-    "print \"The value of Eo=\",round(eo,5),\" N/C\\n The value of Bo=\",\n",
-    "print bo\n",
-    "print \"T\"\n"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 2",
-   "language": "python",
-   "name": "python2"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 2
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.11"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 0
-}