The colour of the fresh silica gal used in breather of the transformer is Suggested Test Series. Suggested Exams. More Electrical Machines Questions Q1. An 8-pole, 3-phase induction motor operates from a supply whose frequency is 50 Hz. Calculate the speed at which the magnetic field of the stator is rotating.
In a synchronous motor, the value of coupling angle depends on:. In which of the following tests, which may be used to measure the synchronous impedance, should the reading be taken in a short time to avoid armature overheating?
A 3-phase induction motor has a slot, 9-coil, 4-pole stator. Calculate the number of coils per phase. A V, 4-pole wave wound DC series motor has conductors on its armature; it has armature and series field resistance of 0. Calculate the magnitude of the induced emf when the magnet in Figure 1 a is thrust into the coil, given the following information: the single loop coil has a radius of 6.
Since the area of the loop is fixed, we see that. While this is an easily measured voltage, it is certainly not large enough for most practical applications. More loops in the coil, a stronger magnet, and faster movement make induction the practical source of voltages that it is. If emf is induced in a coil, N is its number of turns. Conceptual Questions A person who works with large magnets sometimes places her head inside a strong field. She reports feeling dizzy as she quickly turns her head.
How might this be associated with induction? A particle accelerator sends high-velocity charged particles down an evacuated pipe.
Explain how a coil of wire wrapped around the pipe could detect the passage of individual particles. Sketch a graph of the voltage output of the coil as a single particle passes through it. Referring to Figure 5 a , what is the direction of the current induced in coil 2: a If the current in coil 1 increases?
Figure 5. Referring to Figure 5 b , what is the direction of the current induced in the coil: a If the current in the wire increases? Referring to Figure 6, what are the directions of the currents in coils 1, 2, and 3 assume that the coils are lying in the plane of the circuit : a When the switch is first closed? Suppose a turn coil lies in the plane of the page in a uniform magnetic field that is directed into the page. The coil originally has an area of 0.
It is stretched to have no area in 0. What is the direction and magnitude of the induced emf if the uniform magnetic field has a strength of 1. Find the average emf induced in his wedding ring, given its diameter is 2. Integrated Concepts Referring to the situation in the previous problem: a What current is induced in the ring if its resistance is0.
An emf is induced by rotating a turn, Find the magnetic field strength needed to induce an average emf of 10, V. Integrated Concepts Approximately how does the emf induced in the loop in Figure 5 b depend on the distance of the center of the loop from the wire?
Integrated Concepts a A lightning bolt produces a rapidly varying magnetic field. If the bolt strikes the earth vertically and acts like a current in a long straight wire, it will induce a voltage in a loop aligned like that in Figure 5 b. What voltage is induced in a 1. The heat transferred will be 2. This is not a significant amount of heat. Skip to main content. Search for:. Determine the direction of the magnetic field B.
Determine whether the flux is increasing or decreasing. You will calculate this magnetic field in the space between capacitor plates, where the electric flux changes but the conduction current is zero. Part A A parallel-plate capacitor of capacitance with circular plates is charged by a constant current. The radius of the plates is much larger than the distance between them, so fringing effects are negligible.
Calculate , the magnitude of the magnetic field inside the capacitor as a function of distance from the axis joining the center points of the circular plates. Hint not displayed What is the rate of change of the electric flux? Hint not displayed Scaling for the area within the Amprian loop Hint not displayed Evaluate the integral Hint not displayed Express your answer in terms of and given quantities. A parallel-plate air-filled capacitor is being charged as in the figure.
The circular plates have radius 4. Problem Find the magnitude of the maximum conduction current density in the wire. Part B Assuming part A. Buka menu navigasi. Tutup saran Cari Cari. Pengaturan Pengguna. Lewati carousel. Karusel Sebelumnya. Karusel Berikutnya. Apa itu Scribd?
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Untuk Nanti. Judul terkait. Karusel Sebelumnya Karusel Berikutnya. Lompat ke Halaman. Cari di dalam dokumen. In other words, the magentic field is always in the positive z direction, and it has no other For your convenience, we restate Faraday's law here: , where is the line integral of the electric field, and the magnetic flux is given by , where is the angle between the magnetic field and the local normal to the surface bounded by the closed loop.
The current in the solenoid is increasing at a What is the magnitude of the induced electric field at a point 0. Take to be the Part A First find , the line integral of around a loop of radius located just outside the left capacitor plate. Correct , and any needed constants given in the introduction. Anurag Determined. Juan Yanez. Lainnya Dari BlueAstro.
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