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diff --git a/2534/CH3/EX3.13/Ex3_13.sce b/2534/CH3/EX3.13/Ex3_13.sce
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+//Ex3_13
+clc
+e = -1.6*10^-19
+m = 9.1*10^-31
+Va = 400
+v = (abs(2*e*Va/m))^.5
+disp("e = "+string(e)+"C")//electron charge
+disp("m = "+string(m)+"Kg")//mass of electron
+disp("Va = "+string(Va)+"V")//anode voltage
+disp("v = (2*e*Va/m)^.5 = "+string(v)+"m/s")//formula used to calculate velocity of electrons
+//as electron traces a circular path, radius of circular path
+H = 47.75
+micro_not = 4*%pi*10^-7
+B = H*micro_not
+disp("B = "+string(B)+"Wb/m-sq")
+r = (v/(e/m)/B)
+disp("r = (v/(e/m))/B = "+string(r)+"m")
+
+//  NOTE : Question is incompletely solved in the textbook