From fba055ce5aa0955e22bac2413c33493b10ae6532 Mon Sep 17 00:00:00 2001 From: hardythe1 Date: Tue, 5 May 2015 14:21:39 +0530 Subject: add books --- Engineering_Physics/chapter10.ipynb | 293 ++++++++++++++++++++++++++++++++++++ 1 file changed, 293 insertions(+) create mode 100755 Engineering_Physics/chapter10.ipynb (limited to 'Engineering_Physics/chapter10.ipynb') diff --git a/Engineering_Physics/chapter10.ipynb b/Engineering_Physics/chapter10.ipynb new file mode 100755 index 00000000..2fc444d1 --- /dev/null +++ b/Engineering_Physics/chapter10.ipynb @@ -0,0 +1,293 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:a79be9375f475037255b00d45fe0971e7606cfc4e70e2a086d7c77b20c6b87d7" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter10:MAGNETIC PROPERTIES OF MATERIALS" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.1:pg-288" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate permeability and susceptibility of the bar\n", + "phi=2.4*10**-5 #magnetic flux in weber\n", + "A=0.2*10**-4 #cross sectional area in m**2\n", + "B=phi/A #magnetic induction in N/Am\n", + "H=1200 #magnetising field in A/m\n", + "mu=B/H\n", + "print \"permeability is mu=\",\"{:.2e}\".format(mu),\"N/A**2\"\n", + "muo=4*math.pi*10**-7 \n", + "chim=(mu/muo)-1\n", + "print \"susceptibility is chim=\",round(chim,2),\"unitless\"\n", + "#the answer is given wrong in the book (round off error) chim=737\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "permeability is mu= 1.00e-03 N/A**2\n", + "susceptibility is chim= 794.77 unitless\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.2:pg-289" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate current should be sent through the solenoid\n", + "l=.10 #length in m\n", + "N=50 #number of turns\n", + "H=5*10**3 #magnetising field in A/m\n", + "i=H*l/N \n", + "print \"current is i=\",i,\"A\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "current is i= 10.0 A\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.3:pg-289" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate magnetic moment of the rod\n", + "#formula is B=muo*(H+I)\n", + "#where H=ni\n", + "n=500.0 #number of turns in turns/m\n", + "i=0.5 #current passed through the solenoid in A\n", + "mur=1200.0 #relative permeability\n", + "I=(mur-1)*n*i #intensity of magnetisation in A/m\n", + "V=10**-3 #volume in m**3\n", + "M=I*V\n", + "print \"the magnetic moment of the rod is M=\",round(M),\"A-m**2\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "the magnetic moment of the rod is M= 300.0 A-m**2\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.4:pg-290" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate flux density,magnetic intensity,permeability of iron\n", + "phi=2.0*10**-6 #flux in the ring in weber\n", + "A=10**-4 #cross-sectional area in m**2\n", + "B=phi/A \n", + "print \"flux density is B=\",\"{:.2e}\".format(B),\"weber/m**2\"\n", + "N=200.0 #number of turns\n", + "i=0.30 #current flows in the windings in A\n", + "l=0.2 #length in m\n", + "H=N*i/l\n", + "print \"magnetic intensity is H=\",H,\"A-turn/m\"\n", + "mu=B/H\n", + "print \"permeability is mu=\",round(mu,6),\"weber/A-m\"\n", + "muo=4*math.pi*10**-7 \n", + "mur=mu/muo\n", + "print \"relative permeability is mur=\",round(mur,2),\"unitless\"\n", + "\n", + "#the answer for H in the book is wrong\n", + "#the answer for mu in book is wrong due to wrong H\n", + "#the answer in book for mur is wrong due to \n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "flux density is B= 2.00e-02 weber/m**2\n", + "magnetic intensity is H= 300.0 A-turn/m\n", + "permeability is mu= 6.7e-05 weber/A-m\n", + "relative permeability is mur= 53.05 unitless\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.5:pg-294" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate number of ampere turns\n", + "l=0.5 #length in m\n", + "mu=6.5*10**-3 #permeability of iron in henry/m\n", + "A=2*10**-4 #area of cross-section in m**-4\n", + "R=l/(mu*A) #reluctance in A-turns/weber\n", + "flux=4*10**-4 #in weber\n", + "mmf=flux*R\n", + "print \"the number of ampere turns is mmf=\",round(mmf,1),\"ampere-turns\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "the number of ampere turns is mmf= 153.8 ampere-turns\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.6:pg-294" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate relative permeability of the medium\n", + "phi=1.5*10**-3 #magnetic flux in weber\n", + "l=math.pi*50*10**-2 #length in m\n", + "A=10*10**-4 #area of cross-section\n", + "N=1000 #number of turns\n", + "i=5 #current in A\n", + "muo=4*math.pi*10**-7\n", + "#phi(magnetic flux)=m.m.f/reluctance\n", + "#phi=N*i*muo*mur*A/l\n", + "#we get,\n", + "mur=phi*l/(N*i*A*muo)\n", + "print \"relative permeability of the medium is mur=\",mur,\"unitless\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "relative permeability of the medium is mur= 375.0 unitless\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex10.7:pg-295" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#to calculate magnetising current\n", + "#formula is phi(magnetic flux)=m.m.f/reluctance\n", + "#phi=N*i*mu*A/l--------eq(1)\n", + "#phi=BA------------eq(2)\n", + "B=0.20 #magnetic flux density in weber/m**2\n", + "l=1 #average length of the circuit in m \n", + "N=100 #number of turns\n", + "mu=7.3*10**-3 #in h.m\n", + "#from eq(1)and eq(2),we get\n", + "i=B*l/(N*mu)\n", + "print \"magnetising current is i=\",round(i,3),\"A\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "magnetising current is i= 0.274 A\n" + ] + } + ], + "prompt_number": 10 + } + ], + "metadata": {} + } + ] +} \ No newline at end of file -- cgit