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diff --git a/sample_notebooks/MohdAsif/Chapter4.ipynb b/sample_notebooks/MohdAsif/Chapter4.ipynb
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+{
+ "metadata": {
+  "Asif": "",
+  "signature": "sha256:721a6a2445404e28ea958d05a879e1927a64948a8c3a5aa0f2d75d58bb60d3b3"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.2.1\n",
+      "#given data :\n",
+      "E_rms=230;       #Voltage rms value in V\n",
+      "Ep=2**(1/2)*E_rms; #peak amplitude\n",
+      "#Result\n",
+      "print\"peak amplitude,Ep(V) = \",Ep"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "peak amplitude,Ep(V) =  230\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.12.1\n",
+      "#given data :\n",
+      "Rm=500;     #in ohm\n",
+      "E_rms=50;   # in V\n",
+      "E_dc=(2**(1/2)*E_rms)/(math.pi/2)   # in V\n",
+      "Im=1*10^-3; #in A\n",
+      "R=E_dc/Im; #in ohm\n",
+      "Rs=(Rm-R)*10**(-3);#in ohm\n",
+      "#result\n",
+      "print\"the resistance,Rs(kohm) = \",round(Rs,4)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "the resistance,Rs(kohm) =  0.5035\n"
+       ]
+      }
+     ],
+     "prompt_number": 41
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.14.1\n",
+      "ff1=1    #form factor\n",
+      "r=1.11   #sine wave form factor\n",
+      "error=((r-ff1)/ff1)*100 #percentage error\n",
+      "#result\n",
+      "print\"percentage error is\",error"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "percentage error is 11.0\n"
+       ]
+      }
+     ],
+     "prompt_number": 22
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.19.1\n",
+      "#given data :\n",
+      "gm=0.005          #iConductance in mho\n",
+      "V1=1.5           #Voltage in V\n",
+      "rd=200*10**3    #resistance in Ohm\n",
+      "Rd=15*10**3    #resistance in Ohm\n",
+      "Rm=75         #resistance in Ohm\n",
+      "I=(gm*V1*((Rd*rd)/(rd+Rd)))/((2*((Rd*rd)/(rd+Rd)))+Rm)*10**3    #Current in mA\n",
+      "#result\n",
+      "print\"current,I(mA) = \",I"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "current,I(mA) =  3.73994853651\n"
+       ]
+      }
+     ],
+     "prompt_number": 30
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.19.3\n",
+      "v1=100  # in volts\n",
+      "v2=30  #in volts\n",
+      "v3=103 # in volts\n",
+      "v4=1 #in volts\n",
+      "x=9 #assume input resistance in Mohm\n",
+      "r4=(v4/v3)*x*10**3   #in kohms\n",
+      "r3=(((v4/v1)*x*10**6)-(r4*10**3))*10**(-3) #in kohms\n",
+      "r2=(((v4/v2)*x*10**6)-((r4+r3)*10**3))*10**(-3) # in kohms\n",
+      "r1=9*10**6-((r2+r3+r4)*10**3) #in ohms\n",
+      "r1=r1*10**(-6)  # Mohm\n",
+      "print\"resistance (R4) in kohm is\",r4\n",
+      "print\"resistance (R3) in kohm is\",r3\n",
+      "print\"resistance (R2) in kohm is\",r2\n",
+      "print\"resistance (R1) in Mohm is\",r1"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "resistance (R4) in kohm is 0\n",
+        "resistance (R3) in kohm is 0.0\n",
+        "resistance (R2) in kohm is 0.0\n",
+        "resistance (R1) in Mohm is 9.0\n"
+       ]
+      }
+     ],
+     "prompt_number": 34
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.19.4\n",
+      "#given data :\n",
+      "rd=150*10**3  #in ohm\n",
+      "Rm=50   # in ohm\n",
+      "Rs=1000*10**3 #in ohm\n",
+      "gm=0.0052  #in mho\n",
+      "rd1=rd/((gm*rd)+1)\n",
+      "V0=gm*((rd1*Rs)/(rd1+Rs))\n",
+      "R0=(2*Rs*rd1)/(Rs+rd1)\n",
+      "I=V0/(R0+Rm)*10**3 #Current in mA\n",
+      "print\"curent,I(mA) = \",round(I,4)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "curent,I(mA) =  2.3005\n"
+       ]
+      }
+     ],
+     "prompt_number": 38
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.19.5\n",
+      "#given data :\n",
+      "V1=1  #in V\n",
+      "I=1.5*10**-3  #in A\n",
+      "rd=200*10^3   # in ohm\n",
+      "Rm=50  # in ohm\n",
+      "Rs=600*10**3   # in ohm\n",
+      "gm=0.005  #in mho\n",
+      "rd1=rd/((gm*rd)+1)\n",
+      "V0=gm*((rd1*Rs)/(rd1+Rs))*V1\n",
+      "R0=(2*Rs*rd1)/(Rs+rd1)\n",
+      "R_cal=(V0/I)-Rm-R0;\n",
+      "print\"resistance ,R_cal(ohm) = \",round(R_cal,4)\n",
+      "# answer is wrong in the textbook"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "resistance ,R_cal(ohm) =  192.3838\n"
+       ]
+      }
+     ],
+     "prompt_number": 40
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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