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/Chapter18_1.ipynb b/Principles_of_Physics_by_F.J.Bueche/Chapter18_1.ipynb
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--- /dev/null
+++ b/Principles_of_Physics_by_F.J.Bueche/Chapter18_1.ipynb
@@ -0,0 +1,209 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 18:Magnetism"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex18.1:pg-901"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The force on the wire is F= 0.000958363  N\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 18_1\n",
+    "import math \n",
+    "  \n",
+    "#To find the force on the wire\n",
+    "b=2*10**-4        #Units in T\n",
+    "i=20           #Units in A\n",
+    "l=0.3          #Units in meters\n",
+    "theta=53                #Units in degrees\n",
+    "thetaa=math.sin(theta*math.pi/180)        #Units in Radians     \n",
+    "f=b*i*l*thetaa               #Units in N\n",
+    "print \"The force on the wire is F=\",round(f,9),\" N\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##  Ex18.2:pg-902"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The magnitude of magnetic field is B= 0.2609  T\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 18_2\n",
+    "import math \n",
+    "  \n",
+    "  #To find the magnitude of the magnetic field\n",
+    "m=1.67*10**-27          #Units in Kg\n",
+    "v=10**6           #Units in meters/sec\n",
+    "r=4*10**-2            #Units in Meters\n",
+    "q=1.6*10**-19           #Units in C or eV\n",
+    "b=(m*v)/(r*q)           #Units in T\n",
+    "print \"The magnitude of magnetic field is B=\",round(b,4),\" T\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##  Ex18.3:pg-903"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The magnetic field exerts a force of q*v*B upwards on the particle.\n",
+      "The particle doesnot deflect because the two forces are equal\n",
+      "Hence v=(E/B)\n",
+      "A particle with this speed will pass through the region of the crossfields and undeflected\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 18_3\n",
+    "import math  \n",
+    "#To show that the particles does not deflect from its straight line path\n",
+    "print \"The magnetic field exerts a force of q*v*B upwards on the particle.\\nThe particle doesnot deflect because the two forces are equal\\nHence v=(E/B)\\nA particle with this speed will pass through the region of the crossfields and undeflected\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##  Ex18.4:pg-903"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The value of B is= 1.2  G\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 18_4\n",
+    "import math  \n",
+    "#To calculate the value of B at a radial distance of 5 cm\n",
+    "u=4*math.pi*10**-7        #Units in T m/A\n",
+    "i=30         #Units in A\n",
+    "r=0.05           #Units in Meters\n",
+    "b=(u*i)/(2*math.pi*r)           #Units in T\n",
+    "b=b*10**4            #Units in G\n",
+    "print \"The value of B is=\",round(b,2),\" G\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##  Ex18.5:pg-904"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The magnetic moment of Hydrogen atom is=\n",
+      "9.319e-24\n",
+      "A meters**2\n"
+     ]
+    }
+   ],
+   "source": [
+    "  #Example 18_5\n",
+    "import math\n",
+    "  \n",
+    "#To find the magnetic moment of hydrogen atom\n",
+    "r=0.53*10**-10        #Units in meters\n",
+    "a=math.pi*r**2         #Units in meters**2\n",
+    "q=1.6*10**-19            #Units in C\n",
+    "f=6.6*10**15          #Units in sec**-1\n",
+    "i=q*f            #Units in A\n",
+    "u=i*a            #Units in A meter**2\n",
+    "print \"The magnetic moment of Hydrogen atom is=\"\n",
+    "print round(u,27)\n",
+    "print \"A meters**2\"\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
+}