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-{
- "metadata": {
- "name": "",
- "signature": "sha256:d58d66ad9738120c070e76177ecbb4c809f35b6cd83a911351fcdee8be9798f2"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Magnetic materials"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.1, Page number 305"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "H=10**6; #magnetic field strength in A/m\n",
- "chi=0.5*10**-5; #magnetic susceptibility\n",
- "\n",
- "#Calculation\n",
- "mew0=4*math.pi*10**-7;\n",
- "M=chi*H;\n",
- "B=mew0*(M+H);\n",
- "B=math.ceil(B*10**3)/10**3; #rounding off to 3 decimals\n",
- "\n",
- "#Result\n",
- "print(\"intensity of magnetisation in A/m is\",M);\n",
- "print(\"flux density in Wb/m^2 is\",B);\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('intensity of magnetisation in A/m is', 5.0)\n",
- "('flux density in Wb/m^2 is', 1.257)\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.2, Page number 306"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "A=6.022*10**23; #avagadro number\n",
- "mew0=4*math.pi*10**-7;\n",
- "w=58.7; #atomic weight of Ni\n",
- "B=0.65; #saturation magnetic induction in Wb/m^2\n",
- "rho=8906; #density in kg/m^3\n",
- "\n",
- "#Calculation\n",
- "rho=rho*10**3; #converting into gm/m^3\n",
- "N=(rho*A)/w;\n",
- "mew_m=B/(N*mew0);\n",
- "#mew_m/(9.27*10^-24) gives mew_m in mewB\n",
- "mew_m=mew_m/(9.27*10**-24);\n",
- "mew_m=math.ceil(mew_m*10**3)/10**3; #rounding off to 3 decimals\n",
- "\n",
- "#Result\n",
- "print(\"magnetic moment of Ni is\",mew_m,\"mew_b\");\n",
- "#that is mew_m=0.61 mew_b"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('magnetic moment of Ni is', 0.611, 'mew_b')\n"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.3, Page number 306"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "mew_0=4*math.pi*10**-7;\n",
- "H=1800; #magnetic field in A/m\n",
- "phi=3*10**-5; #magnetic flux in Wb\n",
- "A=0.2; #area of cross section in cm^2\n",
- "\n",
- "#Calculation\n",
- "A=A*10**-4; #area in m^2\n",
- "B=phi/A;\n",
- "mew_r=B/(mew_0*H);\n",
- "mew_r=math.ceil(mew_r*10**3)/10**3; #rounding off to 3 decimals\n",
- "\n",
- "#Result\n",
- "print(\"permeability of material is\",mew_r);"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('permeability of material is', 663.146)\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.4, Page number 307"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "mew=18.4; #magnetic moment in mew_b\n",
- "a=0.835; #lattice parameter in nm\n",
- "\n",
- "#Calculation\n",
- "mew=mew*9.27*10**-24;\n",
- "a=a*10**-9; #converting nm to m\n",
- "V=a**3;\n",
- "M=mew/V;\n",
- "M=M/10**5;\n",
- "M=math.ceil(M*10**4)/10**4; #rounding off to 4 decimals\n",
- "\n",
- "#Result\n",
- "print(\"saturation magnetisation in A/m is\",M,\"*10**5\");"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('saturation magnetisation in A/m is', 2.9299, '*10**5')\n"
- ]
- }
- ],
- "prompt_number": 8
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.5, Page number 307"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "mew_0=4*math.pi*10**-7;\n",
- "H=2*10**5; #magnetic field strength in A/m\n",
- "mew_r=1.01; #relative permeability\n",
- "\n",
- "#Calculation\n",
- "B=mew_0*mew_r*H;\n",
- "B=math.ceil(B*10**5)/10**5; #rounding off to 3 decimals\n",
- "M=(B/mew_0)-H;\n",
- "M=math.ceil(M*10**2)/10**2; #rounding off to 2 decimals\n",
- "\n",
- "#Result\n",
- "print(\"magnetic flux density in Wb/m^2 is\",B);\n",
- "print(\"magnetisation in A/m is\",M);\n",
- "\n",
- "#answer for magnetisation given in the book is wrong"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('magnetic flux density in Wb/m^2 is', 0.25385)\n",
- "('magnetisation in A/m is', 2007.42)\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example number 10.6, Page number 307"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "#importing modules\n",
- "import math\n",
- "\n",
- "#Variable declaration\n",
- "mew_0=4*math.pi*10**-7;\n",
- "H=500; #magnetic field strength in A/m\n",
- "chi=1.2; #susceptibility\n",
- "\n",
- "#Calculation\n",
- "M=chi*H;\n",
- "B=mew_0*(M+H);\n",
- "B=B*10**3;\n",
- "B=math.ceil(B*10**4)/10**4; #rounding off to 4 decimals\n",
- "\n",
- "#Result\n",
- "print(\"magnetic flux density in Wb/m^2 is\",B,\"*10**-3\");"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "('magnetic flux density in Wb/m^2 is', 1.3824, '*10**-3')\n"
- ]
- }
- ],
- "prompt_number": 14
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [],
- "language": "python",
- "metadata": {},
- "outputs": []
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-01-10 09:28:22 +0000