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diff --git a/3640/CH4/EX4.2/Ex4_2.sce b/3640/CH4/EX4.2/Ex4_2.sce
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+clc
+//this is an extension of Ex4_1
+//following comes from Ex4_1
+SCL=1000 //stator copper loss in watts
+V=460 //line voltage of induction motor in volts
+I=25 //line current of motor in amperes
+pf=0.85 //power factor of motor
+Pin=sqrt(3)*V*I*pf //ans  may vary due to roundoff error
+Pg=Pin-SCL //air gap power
+RCL=500 //rotor copper loss in watts
+Phe=800 //core loss in watts
+Pfw=250 //winding and friction loss in Watts
+PLL=200 //stray load loss in watts
+DMP=Pg-RCL ///developed mechanical power in watts
+Prot=Phe+Pfw+PLL //power loss in rotor in watts
+Pout=DMP-Prot
+//above is from Ex4_1
+s=RCL/Pg
+p=4 //no of poles
+mprintf("s=RCL/Pg=%f\n",s)//ans may vary due to roundoff error
+ws=(4*%pi*60)/p //synchronous angular frequency 
+mprintf("ws=%frad/s\n",ws)//ans may vary due to roundoff error
+ns=(120*60)/p
+mprintf("ns=%drev/min\n",ns)//ans may vary due to roundoff error
+w=ws*(1-s)
+n=ns*(1-s)
+mprintf("w=ws(1-s)=%frad/s\n",w)//ans may vary due to roundoff error
+mprintf("n=ns(1-s)=%frev/min\n",n)//ans may vary due to roundoff error
+mprintf("τd=DMP/w=%fN-m\n",DMP/w)//ans may vary due to roundoff error
+mprintf("τ=Pout/w=%fN-m\n",Pout/w)//ans may vary due to roundoff error
+
+
+
+
+