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   "source": [
    "# Ch-21 : Transducers"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Page No. 632 Example 21.1."
   ]
  },
  {
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   "execution_count": 1,
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   "outputs": [
    {
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     "text": [
      "The electron mobility, un = sigma*RH =2000.00 cm**2/V-s\n"
     ]
    }
   ],
   "source": [
    "u=10.*200 # in cm**2/V-s\n",
    "print \"The electron mobility, un = sigma*RH =%0.2f cm**2/V-s\"%u"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Page No. 633 Example 21.2."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "We know that the electron mobilty, un = sigma/nq\n",
      "Therefore, the electron concentration,\n",
      "           n = sigma / uq =1.25e+22 m**-3\n"
     ]
    }
   ],
   "source": [
    "n=10./((50*10**-4)*(1.6*10**-19))  # m**-3\n",
    "print \"We know that the electron mobilty, un = sigma/nq\"\n",
    "print \"Therefore, the electron concentration,\"\n",
    "print \"           n = sigma / uq =%0.2e m**-3\"%n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Page No. 634 Example 21.3."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "We know that the number of conduction electrons, i.e. electron density,\n",
      "       n = B*I/VH*q*w =5.00e+21 m**3\n"
     ]
    }
   ],
   "source": [
    "n=(1.2*20)/(60*(1.6*10**-19)*(0.5*10**-3)) #  in m**3\n",
    "print \"We know that the number of conduction electrons, i.e. electron density,\"\n",
    "print \"       n = B*I/VH*q*w =%0.2e m**3\"%n"
   ]
  }
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