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+//Example 12// Ch 4
+clc;
+clear;
+close;
+// given data
+V = 200;//alternating voltage in kV(rms)
+x = 0.1;//uniform gap in meters
+f = 50;//frequency of voltage in Hz
+k = 1.4*10^-4;//mobility of positive ions in m2/s.V
+Ea = V*sqrt(2)*10^3/x;//alternating field in V/m
+printf("alternating field %e V/m",Ea)
+w = k*Ea/(2*%pi*f);
+t = sinm(x/w)/314;
+printf("travel time of positive ions from one electrode to other %f sec",t)
+fmax = k*Ea/(2*%pi*x)
+printf("maximum frequency that can be applied %f Hz",fmax)