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20. the ultimate charge on each? 60. an is air 52. Three condensers are arranged as in Fig. 20. What is the system before and after the points A and B total energy of the are short-circuited? 3O YO/fe si Fig. 20 is Fig. 21 53. Three condensers are arranged as shown in Fig. 21. the ultimate charge on each? What KIRCHHOFF'S LAWS is 31 54. Three condensers are arranged as shown in Fig. 22. the ultimate charge on each? so ohms What o\vo/ts Fig. 23 Fig. 22 55. Three condensers are arranged as shown in Fig.
And its terminals marked accordingly. A further extension of the first law is also necessary. About any insulated junction the charges must all be of the nature of induced charges and their algebraic sum must be zero. If all these conventions are strictly adhered to the solution of problems will be greatly facilitated. PROBLEMS 1. fs. are 10 volts and 15 volts and whose internal resistances are 1 ohm and 2 ohms respectively have their positive terminals connected to one end of a coil of 5 ohms resistance and their negative terminals connected to the opposite end.
Per min. the armature current is 70 amperes. If the field is increased 50 per cent at what speed will the motor run when it gives a is torque of 60 pound-feet? Neglect the stray power. 31. The field of the motor in problem 30 is readjusted so that the motor runs at 1000 rev. , when it gives a torque of 50 pound-feet. By what per cent has the field been changed and what current does the armature take under these conditions? Neglect the stray power. A 32. 4 ohm, takes a current of 30 amperes from 110- volt mains and runs at a speed of 1200 rev.