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{
"metadata": {
"name": "Chapter 10"
},
"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": "#To calculate the intensity of magnetisation and flux density\n\n#importing modules\nimport math\n\n#Variable declaration\nH=10**6; #magnetic field strength in A/m\nchi=0.5*10**-5; #magnetic susceptibility\n\n#Calculation\nmew0=4*math.pi*10**-7;\nM=chi*H;\nB=mew0*(M+H);\nB=math.ceil(B*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"intensity of magnetisation in A/m is\",M);\nprint(\"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": "#To calculate the magnetic moment\n\n#importing modules\nimport math\n\n#Variable declaration\nA=6.022*10**23; #avagadro number\nmew0=4*math.pi*10**-7;\nw=58.7; #atomic weight of Ni\nB=0.65; #saturation magnetic induction in Wb/m^2\nrho=8906; #density in kg/m^3\n\n#Calculation\nrho=rho*10**3; #converting into gm/m^3\nN=(rho*A)/w;\nmew_m=B/(N*mew0);\n#mew_m/(9.27*10^-24) gives mew_m in mewB\nmew_m=mew_m/(9.27*10**-24);\nmew_m=math.ceil(mew_m*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"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": "#To calculate the permeability\n\n#importing modules\nimport math\n\n#Variable declaration\nmew_0=4*math.pi*10**-7;\nH=1800; #magnetic field in A/m\nphi=3*10**-5; #magnetic flux in Wb\nA=0.2; #area of cross section in cm^2\n\n#Calculation\nA=A*10**-4; #area in m^2\nB=phi/A;\nmew_r=B/(mew_0*H);\nmew_r=math.ceil(mew_r*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"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": "#To calculate the saturation magnetisation \n\n#importing modules\nimport math\n\n#Variable declaration\nmew=18.4; #magnetic moment in mew_b\na=0.835; #lattice parameter in nm\n\n#Calculation\nmew=mew*9.27*10**-24;\na=a*10**-9; #converting nm to m\nV=a**3;\nM=mew/V;\nM=M/10**5;\nM=math.ceil(M*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"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": "#To calculate the value of B and M\n\n#importing modules\nimport math\n\n#Variable declaration\nmew_0=4*math.pi*10**-7;\nH=2*10**5; #magnetic field strength in A/m\nmew_r=1.01; #relative permeability\n\n#Calculation\nB=mew_0*mew_r*H;\nB=math.ceil(B*10**5)/10**5; #rounding off to 3 decimals\nM=(B/mew_0)-H;\nM=math.ceil(M*10**2)/10**2; #rounding off to 2 decimals\n\n#Result\nprint(\"magnetic flux density in Wb/m^2 is\",B);\nprint(\"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": "#To calculate the magnetic flux density\n\n#importing modules\nimport math\n\n#Variable declaration\nmew_0=4*math.pi*10**-7;\nH=500; #magnetic field strength in A/m\nchi=1.2; #susceptibility\n\n#Calculation\nM=chi*H;\nB=mew_0*(M+H);\nB=B*10**3;\nB=math.ceil(B*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"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": {}
}
]
}
|
