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+//Problem 17.10: The field winding of a 110 V, d.c. motor has a resistance of 15 ohms and a time constant of 2 s. Determine the inductance and use the tangential method to draw the current/time characteristic when the supply is removed and replaced by a shorting link. From the characteristic determine (a) the current flowing in the winding 3 s after being shorted-out and (b) the time for the current to decay to 5 A.
+
+//initializing the variables:
+R = 15; // in ohms
+V = 110; // in Volts
+tou = 2; // in secs
+t1 = 3; // in secs
+i2 =5; // in amperes
+
+//calculation:
+L = tou*R
+t = 0:0.1:10
+I = V/R
+i = I*(%e^(-1*t/tou))
+plot2d(t,i)
+xtitle("current/time characteristic", "t", "i")
+i1 = I*(%e^(-1*t1/tou))
+t2 = -1*tou*log((i2/I))
+
+printf("\ = \n\n Result \n\n")
+printf("\n inductance is %.0f H",L)
+printf("\n (a)the current flowing in the winding 3 s after being shorted-out is %.2f A",i1)
+printf("\n (b)the time for the current to decay to 5 A is %.3f sec",t2)
+\ No newline at end of file