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+clc;clear;
+//Example 4.2
+//electrostatic deflection
+//given values
+V1=2000;//in volts,potential difference through which electron beam is accelerated
+l=.04;//length of rectangular plates
+d=.015;//distance between plates
+V=50;//potential difference between plates
+//calculations
+alpha=atan(l*V/(2*d*V1))*(180/%pi);//in degrees
+disp(alpha,'angle of deflection of electron beam is:');
+v=5.93*10^5*sqrt(V1);//horizontal velocity in m/s
+t=l/v;//in s
+disp(t,'transit time through electric field is:')
+\ No newline at end of file