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"cell_type": "heading",
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"metadata": {},
"source": [
"Chapter13:SUPERCONDUCTIVITY"
]
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{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"\n",
"Ex13.1:pg-357"
]
},
{
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"input": [
"#example 1\n",
"#to calculate value of Temperature\n",
"import math\n",
"Bc=105.0*10**3 #magnetic field in amp/m\n",
"Bo=150.0*10**3 #critical field of the metal in amp/m \n",
"Tc=9.2 #critical temperature of the metal in K\n",
"T=Tc*math.sqrt(1-(Bc/Bo))#temperature\n",
"print\"\\n the value of temperature is\",round(T,3),\"K\"\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" the value of temperature is 5.039 K\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex13.2:pg-357"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#example 2\n",
"#to calculate temperature\n",
"import math\n",
"Tc=7.18 #critical temperature in K\n",
"Bc=4.5*10**3 #critical field in A/m\n",
"Bo=6.5*10**3 #critical magnetic field in A/m\n",
"T=Tc*math.sqrt(1-(Bc/Bo))# temperature\n",
"print\"\\n the temperature is\",round(T,2),\"K\"\n",
"#to calculate critical current density at that temperature\n",
"r=1*10**-3 #diameter of the wire in mm\n",
"TJc=(Bc*2*math.pi*r)/(math.pi*r**2)# critical current density\n",
"print\"\\n the critical current density at that temperature is\",round(TJc,2),\"A/m^2\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" the temperature is 3.98 K\n",
"\n",
" the critical current density at that temperature is 9000000.0 A/m^2\n"
]
}
],
"prompt_number": 10
},
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"language": "python",
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