A loop is placed near a current carrying wire as shown in the figure. I theexpertta.com Which of the following will induce a counterclockwise EMF as shown? Current flowing to right and decreasing Current flowing to left and decreasing Current flowing to left and increasing Current flowing to right and increasing

A loop is placed near a current carrying wire as shown in the figure. I theexpertta.com Which of the following will induce a counterclockwise EMF as shown? Current flowing to right and decreasing Current flowing to left and decreasing Current flowing to left and increasing Current flowing to right and increasing

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 74AP: The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected...

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The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?
A small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor draws 4.0 A, and when the armature is clamped so that it cannot turn, the motor draws 24 A. What is the back emf when tire motor is operating normally?
A 120-V, series-wound motor has a field resistance of 80 and an armature resistance of 10. When it is operating at full speed, a back emf of 75 V is generated, (a) What is the initial current drawn by the motor? When the motor is operating at full speed, where are (b) the current drawn by the motor, (c) the power output of the source, [ d) the power output of the motor, and (e) the power dissipated in the two resistances?
Does the induced emf always act to decrease the magnetic flux through a circuit?
. The generator at a large power plant has an output of 1,000,000 kW at 24,000 V. (a) If it were a DC generator, what would he the current in it? (b) What is its energy output each day—in joules and in kilowatt—hours? (c) If this energy is sold at a price of 10 cents per kilowatt-hour, how much revenue does the power plant generate each day?
The accompanying figure shows a metal disk of inner radius r1 and other radius r2 rotating at an angular velocity while in a uniform magnetic field directed parallel to the rotational axis. The brush leads of voltmeter are connected to the dark's inner and outer surfaces as shown. What is the reading of the voltmeter ?
Check Your Understanding. A changing current induces an emf of 10 V across a 0.25-H inductor. What is the rate at which the current is changing?
Problem 5: A loop is placed near a current carrying wire as shown in the figure. > A Which of the following will induce a counterclockwise EMF as shown? OCurrent flowing to right and increasing OCurrent flowing to right and decreasing OCurrent flowing to left and decreasing OCurrent flowing to left and increasing
A bar magnet is positioned near a coil of wire, as shown in the figure below. pccccc R What is the direction of the current in the resistor when the magnet is moved to the left and to the right? (a) to the left (b) to the right The current is right to left. The current is left to right. No current is induced. No current is induced. The current is right to left. The current is left to right.
A DC servo motor produces 10 milli N-m torque (Tm) with current (im) of 0.25 A with a DC supply (vm) of 20 V. The terminal resistance of the motor (Rm) is 8 Q. What is the torque constant k, of the motor? If the back-emf constant km is the same as the torque constant, what is the back-emf at this condition? What is the speed of the motor in rotations per minute? Assume that the motor operates at steady-state: im(t) = im and wm (t) = Wm.
This is not and will not be graded 5. What is the rate at which the current though a 0.30-H coil is changing if an emf of 0.12 V isinduced across the coil?
a) What is the voltage output (in V) of a transformer used for rechargeable flashlight batteries, if its primary has 490 turns, its secondary 8 turns, and the input voltage is 119 V? b) What input current (in mA) is required to produce a 4.00 A output? c) What is the power input (in W)?