{ "metadata": { "name": "", "signature": "sha256:977816390da876a89acf9dab4a43ac1149d2a8f7e4f57b74a89090971103e376" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter 15 Electromagnetic waves" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.1 Page no 836" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "e=8.854*10**-12 #C**2/N/m**2\n", "A=10**-4 #m**2\n", "E=3*10**6 #V/ms\n", "\n", "#Calculation\n", "Id=e*A*E\n", "\n", "#Result\n", "print\"Displacement current is\", round(Id*10**9,1)*10**-9,\"A\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Displacement current is 2.7e-09 A\n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.2 Page no 836" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "Id=1 #A\n", "C=10.0**-6 #F\n", "\n", "#Calculation\n", "V=Id/C\n", "\n", "#Result\n", "print\"Instantaneous current is\", V,\"V/S\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Instantaneous current is 1000000.0 V/S\n" ] } ], "prompt_number": 10 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.3 Page no 836" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "I=0.15 #A\n", "R=0.12 #m\n", "r=0.065 #m\n", "r1=0.15 #m\n", "\n", "#Calculation\n", "import math\n", "A=math.pi*R**2\n", "u=4*math.pi*10**-7\n", "B=(u*I*r)/(2*math.pi*R**2)\n", "B1=(u*I)/(2*math.pi*r1)\n", "Bmax=(u*I)/(2*math.pi*R)\n", "\n", "#Result\n", "print\"(i) (a) Magnetic field on the axis is zero\"\n", "print\"(b) Magnetic field at r=6.5 cm is\",round(B*10**7,2)*10**-7 ,\"T\"\n", "print\"(c) Magnetic field at r=15 cm is\", B1,\"T\"\n", "print\"(ii) Distance is\", Bmax,\"T\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "(i) (a) Magnetic field on the axis is zero\n", "(b) Magnetic field at r=6.5 cm is 1.35e-07 T\n", "(c) Magnetic field at r=15 cm is 2e-07 T\n", "(ii) Distance is 2.5e-07 T\n" ] } ], "prompt_number": 24 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.5 Page no 837" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "r=0.05 #m\n", "E=10**12 #V/m/s\n", "e=8.854*10**-12\n", "\n", "#Calculation\n", "import math\n", "Id=e*math.pi*r**2*E\n", "\n", "#Result\n", "print\"Displacement current is\", round(Id,4),\"A\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Displacement current is 0.0695 A\n" ] } ], "prompt_number": 29 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.7 Page no 846 " ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "E=100 #v\n", "c=3.0*10**8\n", "\n", "#Calculation\n", "import math\n", "B=E/c\n", "u=4.0*math.pi*10**-7\n", "H=B/u\n", "U=e*E**2\n", "\n", "#Result\n", "print\"(i) Value of B is\", round(B*10**7,2)*10**-7,\" T\"\n", "print\"(ii) Value of H is\",round(H,3),\"A/m\"\n", "print\"(iii) Energy density is\",U,\"J/m**3" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "(i) Value of B is 3.33e-07 T\n", "(ii) Value of H is 0.265 A/m\n", "(iii) Energy density is 8.854e-08\n" ] } ], "prompt_number": 41 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.8 Page no 847" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "E0=8*10**-4 #v\n", "c=3.0*10**8\n", "w=6*10**6\n", "\n", "#Calculation\n", "import math\n", "B0=E0/c\n", "f=w/(2.0*math.pi)\n", "l=c/f\n", "\n", "#Result\n", "print\"Wavelength of the wave is\", round(l*10**-4,4),\"m\"\n", "print\"Frequency is\",round(f*10**-6,3),\"*10**10 Hz\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Wavelength of the wave is 0.0314 m\n", "Frequency is 0.955 *10**10 Hz\n" ] } ], "prompt_number": 56 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.9 Page no 847" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "E=6.3 #V/m\n", "c=3.0*10**8\n", "\n", "#Calculation\n", "B=E/c\n", "\n", "#Result\n", "print\"B=\", B,\"K^ Tesla\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "B= 2.1e-08 K^ Tesla\n" ] } ], "prompt_number": 59 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.10 Page no 847" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "f=18 #W/cm**2\n", "A=20 #cm**2\n", "t=30*60\n", "\n", "#Calculation\n", "U=f*A*t\n", "P=U/c\n", "F=P/t\n", "P1=2*P\n", "F1=P1/t\n", "\n", "#Result\n", "print\"Average force exerted on the surface is\", F1,\"N\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Average force exerted on the surface is 2.4e-06 N\n" ] } ], "prompt_number": 65 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.11 Page no 847" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Given\n", "r=3.0 #m\n", "n=0.025\n", "P=100 #w\n", "C=3*10**8\n", "\n", "#Calculation \n", "import math\n", "A=4*math.pi*r**2\n", "I=(n*P)/A\n", "E0=math.sqrt((2*I)/(e*C))\n", "B0=E0/C\n", "\n", "#Result\n", "print\"Peak value of electric field is\", round(E0,2),\"V/m\"\n", "print\"Peak value of magnetic field is\",round(B0*10**8,2)*10**-8,\"T\"\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Peak value of electric field is 4.08 V/m\n", "Peak value of magnetic field is 1.36e-08 T\n" ] } ], "prompt_number": 76 } ], "metadata": {} } ] }