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/Chapter20_1.ipynb b/Principles_of_Physics_by_F.J.Bueche/Chapter20_1.ipynb
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@@ -0,0 +1,236 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 20: Alternating Currents and Electronics"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex20.1:pg-982"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "We have to wait for a time of t= 10.0  sec\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 20_1\n",
+    "import math  \n",
+    "#To findout the time that it has to wait after turning off the set before it is safe to touch capacitor\n",
+    "r=10.0**6          #Units in Ohms\n",
+    "c=10.0**-5             #Units in F\n",
+    "ti=r*c           #Units in Sec\n",
+    "print \"We have to wait for a time of t=\",round(ti),\" sec\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex20.2:pg-983"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The RMS current when f=20 Hz is= 0.00402  Ohms\n",
+      "The RMS current when f=2*10**6 Hz is= 402.12  Ohms\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 20_2\n",
+    "\n",
+    "import math\n",
+    "  \n",
+    "#To find the rms current in the circuit \n",
+    "f=20         #Units in Hz\n",
+    "c=4*10.0**-7         #Units in F\n",
+    "xc=1/(2.0*math.pi*f*c)           #Units in Ohms/sec\n",
+    "f=2*10**6          #Units in Hz\n",
+    "xc1=1/(2*math.pi*f*c)           #Units in Ohms/sec\n",
+    "v=80.0           #Units in V\n",
+    "i=v/xc            #Units in A\n",
+    "i1=v/xc1            #Units in A\n",
+    "print \"The RMS current when f=20 Hz is=\",round(i,5),\" Ohms\\nThe RMS current when f=2*10**6 Hz is=\",round(i1,2),\" Ohms\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex20.3:pg-984"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The current in the inductor when frequency=60 Hz is I= 7.07  A\n",
+      "\n",
+      "The current in the inductor when frequency=6*10**2 Hz is I= 0.000707  A\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 20_3\n",
+    "import math \n",
+    "  \n",
+    "#To find the current through the inductor\n",
+    "f=60             #Units in Hz\n",
+    "l=15.0*10**-3           #Units in H\n",
+    "xl=2*math.pi*f*l           #Units in Ohms\n",
+    "v=40          #Units in V\n",
+    "i=v/xl           #Units in A\n",
+    "print \"The current in the inductor when frequency=60 Hz is I=\",round(i,2),\" A\"\n",
+    "f=6.0*10**5             #Units in Hz\n",
+    "l=15.0*10**-3           #Units in H\n",
+    "xl=2*math.pi*f*l           #Units in Ohms\n",
+    "v=40          #Units in V\n",
+    "i=v/xl           #Units in A\n",
+    "print \"\\nThe current in the inductor when frequency=6*10**2 Hz is I=\",round(i,6),\" A\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex20.4:pg-984"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The current in circuit is I= 0.2439  A\n",
+      "Volt meter readings across resistor Vr= 73.2  V\n",
+      "Readings across capacitor is Vc= 32.3  V\n",
+      "Power loss in circuit is= 17.8  W\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 20_4\n",
+    "import math \n",
+    "  \n",
+    "#To find current in circuit, Voltmeter reading, reading across capacitor and power loss\n",
+    "f=2000             #Units in Hz\n",
+    "c=0.6*10**-6           #Units in F\n",
+    "xc=1/(2*math.pi*f*c)           #Units in Ohms\n",
+    "r=300          #Units in Ohms\n",
+    "z=math.sqrt(r**2+xc**2)        #Units in Ohms\n",
+    "v=80          #Units in V\n",
+    "i=v/z            #Units in A\n",
+    "vr=i*r      #Units in V\n",
+    "vc=i*xc          #Units in V\n",
+    "p=i**2*r           #Units in W\n",
+    "print \"The current in circuit is I=\",round(i,4),\" A\\nVolt meter readings across resistor Vr=\",round(vr,1),\" V\\nReadings across capacitor is Vc=\",round(vc,1),\" V\\nPower loss in circuit is=\",round(p,1),\" W\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex20.5:pg-984"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The current in circuit is I= 2.17  A\n",
+      "Volt meter reading across R Vr= 43.4  V\n",
+      "Volt meter reading across L Vl= 32.7  V\n",
+      "Volt meter reading across c Vc= 57.6  V\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 20_5\n",
+    "\n",
+    "import math  \n",
+    "#To find the current in circuit and voltmeters reading across R C and L\n",
+    "f=600           #Units in Hz\n",
+    "l=4.0*10**-3           #Units in H\n",
+    "xl=2*math.pi*f*l          #Units in Ohms\n",
+    "c=10.0*10**-6           #Units in F\n",
+    "xc=1/(2*math.pi*f*c)         #Units in Ohms\n",
+    "r=20.0         #Units in Ohms\n",
+    "z=math.sqrt(r**2+(xl-xc)**2)        #Units in Ohms\n",
+    "v=50.0           #Units in V\n",
+    "i=v/z          #Units in A\n",
+    "vr=i*r      #Units in V\n",
+    "vl=i*xl        #Units in V\n",
+    "vc=i*xc      #Units in V\n",
+    "print \"The current in circuit is I=\",round(i,2),\" A\\nVolt meter reading across R Vr=\",round(vr,1),\" V\\nVolt meter reading across L Vl=\",round(vl,1),\" V\\nVolt meter reading across c Vc=\",round(vc,1),\" V\\n\"\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
+}