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{
"metadata": {
"name": "",
"signature": "sha256:f383b09bed78232b6f6bef91df71b6fd8febd00a3f89287a33c756d53748eb03"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"14: Superconductivity"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 14.1, Page number 272"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"Bc0=0.0305; #critical field(T)\n",
"T=2; #temperature(K)\n",
"Tc=3.722; #critical temperature(K)\n",
"r=2*10**-3; #diameter(m)\n",
"mew0=4*math.pi*10**-7; #magnetic permeability\n",
"\n",
"#Calculation\n",
"BcT=Bc0*(1-(T/Tc)**2); #critical field(T)\n",
"Ic=2*math.pi*r*BcT/mew0; #current(A)\n",
"\n",
"#Result\n",
"print \"current is\",round(Ic,1),\"A\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"current is 216.9 A\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 14.2, Page number 274"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"lamda0=37; #london penetration depth(nm)\n",
"T=5.2; #temperature(K)\n",
"Tc=7.193; #critical temperature(K)\n",
"\n",
"#Calculation\n",
"a=1-(T/Tc)**4;\n",
"lamdaT=lamda0*(a**(-1/2)); #penetration depth of lead(nm)\n",
"\n",
"#Result\n",
"print \"penetration depth of lead is\",round(lamdaT,3),\"nm\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"penetration depth of lead is 43.398 nm\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
