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{
"metadata": {
"name": "Chapter8"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "8: Magnetic Materials"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 8.1, Page number 238"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#importing modules\nimport math\n\n#Variable declaration\nI = 12; #current(Ampere)\nA = 7.5*10**-4 #area of loop(m**2)\n\n#Calculation\nM = I*A; #magnetic moment(Am**2)\nM = M*10**3;\n\n#Result\nprint \"magnetic moment is\",M,\"*10**-3 Am**2\"\nprint \"magnetic moment is in opposite direction from the observer\"\nprint \"M is perpendicular to the plane\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "magnetic moment is 9.0 *10**-3 Am**2\nmagnetic moment is in opposite direction from the observer\nM is perpendicular to the plane\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 8.2, Page number 238"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#importing modules\nimport math\n\n#Variable declaration\nr = 0.5; #radius of orbit(Angstrom)\ne = 1.6*10**-19; #charge of electron(C)\nnew = 10**16; #frequency(rps)\n\n#Calculation\nr = r*10**-10; #radius of orbit(m)\nI = e*new; #current(Ampere)\nA = math.pi*r**2; #area enclosed(m**2)\nM = I*A; #magnetic moment(Am**2)\n\n#Result\nprint \"magnetic moment is\",M,\"Am**2\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "magnetic moment is 1.25663706144e-23 Am**2\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 8.3, Page number 239"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#importing modules\nimport math\n\n#Variable declaration\nmew_r = 5000; #relative permeability\n\n#Calculation\nchi_m = mew_r-1; #magnetic susceptibility\n\n#Result\nprint \"magnetic susceptibility is\",chi_m",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "magnetic susceptibility is 4999\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 8.4, Page number 239"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#importing modules\nimport math\n\n#Variable declaration\nH = 1800; #magnetic field(A/m)\nphi = 3*10**-5; #magnetic flux(Wb)\nA = 0.2; #cross sectional area(cm**2)\n\n#Calculation\nA = A*10**-4; #cross sectional area(m**2)\nB = phi/A; #magnetic flux density(Wb/m**2)\nmew = B/H; #permeability(H/m)\nmew = mew*10**4;\nmew=math.ceil(mew*100)/100; #rounding off to 2 decimals\n\n#Result\nprint \"permeability is\",mew,\"*10**-4 H/m\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "permeability is 8.34 *10**-4 H/m\n"
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example number 8.5, Page number 239"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#importing modules\nimport math\n\n#Variable declaration\nB = 0.65; #magnetic induction(Wb/m**2)\nrho = 8906; #density(kg/m**3)\nM = 58.7; #atomic weight\nmew0 = 4*math.pi*10**-7;\nmb = 9.27*10**-24;\nNa = 6.023*10**26; #avagadro constant\n\n#Calculation\nN = rho*Na/M; #number of atoms per unit volume(atoms/m**3)\nmew_r = B/(N*mew0); #relative permeability(A/m**2)\nM = mew_r/mb; #magnetic moment in mew_B \nM=math.ceil(M*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint \"magnetic moment is\",M,\"mew_B\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "magnetic moment is 0.611 mew_B\n"
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
