Added(A)/Deleted(D) following books

 A  Principles_of_Physics_by_F.J.Bueche/Chapter10_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter10_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter11_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter13_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter14_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter15_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter16_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter17_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter18_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter19_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter1_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter1_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter20_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter21_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter22_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter23_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter24_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter25_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter26_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter27_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter2_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter2_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter3_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter3_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter4_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter4_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter5_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter5_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter6_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter6_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter7_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter7_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter8_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter9_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter9_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/chapter12_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/screenshots/11.2_1.png
A  Principles_of_Physics_by_F.J.Bueche/screenshots/24.4_1.png
A  Principles_of_Physics_by_F.J.Bueche/screenshots/8.4_1.png

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diff --git a/Principles_of_Physics_by_F.J.Bueche/Chapter19_1.ipynb b/Principles_of_Physics_by_F.J.Bueche/Chapter19_1.ipynb
new file mode 100644
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--- /dev/null
+++ b/Principles_of_Physics_by_F.J.Bueche/Chapter19_1.ipynb
@@ -0,0 +1,247 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 19:Electromagnetic Induction"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.1:pg-938"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The flux in the room is Phi= 0.00012  T meters**2\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_1\n",
+    " \n",
+    "  \n",
+    "  #To find the flux in the room\n",
+    "l=4         #Units in meters\n",
+    "b=0.8         #Units in meters\n",
+    "theta=20        #Units in degrees\n",
+    "a=l*b       #Units in meters**2\n",
+    "b=4*10**-5         #Units in T\n",
+    "thetaa=math.cos(theta*math.pi/180)         #Units in radians\n",
+    "phi=b*thetaa*a        #Units in T meters**2\n",
+    "print \"The flux in the room is Phi=\",round(phi,5),\" T meters**2\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.2:pg-939"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The average emf Induced is emf= 1.0  V\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_2\n",
+    " \n",
+    "  \n",
+    "  #To find how large is the average EMF induced\n",
+    "b=0.5          #Units in T\n",
+    "a=4*10**-4          #Units in meters**2\n",
+    "phi2=b*a            #Units in Wb\n",
+    "phi1=0            #Units in Wb\n",
+    "deltaPHI=phi2-phi1       #Units in Wb\n",
+    "n=100.0         #Units in Constant\n",
+    "deltaT=2.0*10**-2          #Units in sec\n",
+    "emf=(n*deltaPHI)/deltaT          #Units in V\n",
+    "print \"The average emf Induced is emf=\",round(emf),\" V\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.3:pg-939"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The emf generated is emf= 50.0  V\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_3\n",
+    " \n",
+    "  \n",
+    "  #To findout how large an emf is generated\n",
+    "m=0.5         #Units in H\n",
+    "i=1          #Units in A\n",
+    "t=0.01           #Units in sec\n",
+    "emf=m*(i/t)             #Units in V\n",
+    "print \"The emf generated is emf=\",round(emf),\" V\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.5:pg-939"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The time constant is L/R= 0.0833  Sec\n",
+      " The energy stored is= 1.0  J\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_5\n",
+    " \n",
+    "  \n",
+    "  #To find the time constant of the circuit and the final energy stored\n",
+    "l=0.5     #Units in H\n",
+    "r1=2          #Units in Ohms\n",
+    "r2=4              #Units in Ohms\n",
+    "r=r1+r2          #Units in Ohms\n",
+    "l_r=l/r    #Units in sec\n",
+    "i=2          #Units in A\n",
+    "ene=0.5*l*i**2\n",
+    "print \"The time constant is L/R=\",round(l_r,4),\" Sec\\n The energy stored is=\",round(ene),\" J\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.6:pg-940"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The emf induced in the rod is emf= 0.000542  V\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_6\n",
+    "#To find the emf induced in the rod\n",
+    "b=0.6*10**-4         #Units in T\n",
+    "v=3         #Units in meters/sec\n",
+    "d=5          #Units in meters\n",
+    "theta=53            #Units in degrees\n",
+    "thetaa=math.cos(theta*math.pi/180)          #Units in radians\n",
+    "emf=b*v*d*thetaa        #Units in V\n",
+    "print \"The emf induced in the rod is emf=\",round(emf,6),\" V\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex19.7:pg-940"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The back emf developed is EMF= 104.0  V\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example19_7\n",
+    " \n",
+    "  \n",
+    "#To calculate the Back emf developed\n",
+    "i=3           #Units in A\n",
+    "r=2.0               #Units in Ohms\n",
+    "v=110.0              #Units in Ohms\n",
+    "e=v-(i*r)         #Units in V\n",
+    "print \"The back emf developed is EMF=\",round(e),\" V\"\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
+}