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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 17: Electromagnetic Waves"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.1: poynting_vector.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // magnitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"R=7*10^8;// in m\n",
+"P=3.8*10^26;// in Watt\n",
+"S=P/(4*%pi*R^2);\n",
+"disp(S,'Magnitude of poynting vector,S(W/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.2: poynting_vector.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // Poynting vector\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"R=1.5*10^11;// in m\n",
+"P=3.8*10^26;// in Watt\n",
+"S=P/(4*%pi*R^2);// in W/m^2\n",
+"Se=round(S*60/(4.2*10^4));\n",
+"disp(Se,'Poynting vector,Se(cal/cm^2 -min) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.3: amplitudes_of_electric_and_magnetic_field_radiation.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Amplitude and magnetic field\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"S=2;// in cal/cm^2- min\n",
+"EH=S*4.2*10^4/60;// joule/m^2 sec\n",
+"mu0=4*%pi*10^-7;\n",
+"epsilon0=8.85*10^-12;\n",
+"EbyH=sqrt(mu0/epsilon0);\n",
+"E=sqrt(EH*EbyH);\n",
+"H=EH/E;\n",
+"E0=E*sqrt(2);\n",
+"H0=H*sqrt(2);\n",
+"disp(E,'E is ,(V/m)=')\n",
+"disp(H,'H is ,(Amp-turn/m)=')\n",
+"disp(E0,'Amplitude of electric fields of radiation,E0(V/m) = ')\n",
+"disp(H0,'Magnetice field of radition ,H0(Amp-turn/m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.4: amplitudes_of_electric_and_magnetic_field_radiation.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // electric and magnetic field\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"r=2;// in m\n",
+"mu0=4*%pi*10^-7;\n",
+"epsilon0=8.85*10^-12;\n",
+"EbyH=sqrt(mu0/epsilon0);\n",
+"EH=1000/(4*r^2*%pi^2);// in W/m^2\n",
+"E=sqrt(EH*EbyH);\n",
+"H=(EH/E);\n",
+"disp(E,'Intensities of electric,E(V/m) = ')\n",
+"disp(H,'Magnetic field of radiation,H(Amp-turn/m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.5: polarisation_degree.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // Degree of polarization\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"thetai=45;// in degree\n",
+"n=1.5;/// index\n",
+"thetar=asind(sind(thetai)/n);\n",
+"Rl=sind(thetai-thetar)^2/sind(thetai+thetar)^2;\n",
+"Rp=tand(thetai-thetar)^2/tand(thetai+thetar)^2;\n",
+"D=((Rl-Rp)/(Rl+Rp))*100;\n",
+"disp(D,'Degree of polarization,D(%) = ')\n",
+"// answer is wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.6: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"del=1;// in m\n",
+"mu=4*%pi*10^-7;// in H/m\n",
+"sigma=4;// in siemen/m\n",
+"v=1*10^-3/(%pi*del^2*mu*sigma);\n",
+"disp(v,'Frequency,v(kHz) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}