1. An n-turn secondary coil of radius r is concentric with aN-turn primary coil of radius R. If the current sourcesupplies AC current, i(t) = io cos (2 7ft), what is theinduced emf in the secondary coil as a function of time?Assume r << R.current sourceIndicate on the diagram, the direction of the induced current in the secondary coil.Mathematical Analysis (solve for the induced emf symbolically)llerodt no mtea gasiloq oesdas bocfogsbivogodenli ono bosd boainnstIf n = 1,000, N= 250, r= 5 cm, R = 18 cm, io = 2.5 A, and f=700 Hz, what is the induced emfvalue.

An n-turn secondary coil of radius r is concentric with a -turn primary coil of radius R. If the current source oplies AC current, i(t) = io cos (2 nft), what is the duced emf in the secondary coil as a function of time? cume r << R. %3D current source e on the diagram, the direction of the induced current in the secondary coil. matical Analysis (soluo f

An n-turn secondary coil of radius r is concentric with a -turn primary coil of radius R. If the current source oplies AC current, i(t) = io cos (2 nft), what is the duced emf in the secondary coil as a function of time? cume r << R. %3D current source e on the diagram, the direction of the induced current in the secondary coil. matical Analysis (soluo f

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter15: Alternating-current Circuits

Section: Chapter Questions

Problem 48P: A transformer is used to supply a 12-V model train with power from a 110-V wall plug. The train...

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A transformer is used to supply a 12-V model train with power from a 110-V wall plug. The train operates at 50 W of power, (a) What is the rms current in the secondary coil of the transformer? (b) What is me rms current in the primary coil? (c) What is the ratio of the number of primary to secondary turns? (d) What is the resistance of the tram? (e) What is the resistance seen by the 110-V source?
A 120-V, series-wound dc motor draws 0.50 A from its power source when operating at full speed, and it draws 2.0 A when it starts. The resistance of the armature coils is 10 , (a) What is the resistance of the field coils? (b) What is tire back emf of the motor when it is running at full speed? (c) The motor operates at a different speed and draws 1.0 A from the source. What is the back emf in this case?
A coil with a self-inductance of 3.0 H carries a current that decreases at a uniform rate dl/dt = -0.050 A/s. What is the emf induced in the coil? Describe the polarity of the induced emf.
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 coil with 50 turns and area 10cm2 is oriented with its plane perpendicular to a 0.75-T magnetic field. If the coil is flipped over (rotated through 180°) in 0.20 s, what is the average emf induced in it?
Figure OQS1.I is a graph of the magnetic flux through a certain coil of wire as a function of time during an interval while the radius of the coil is increased, the coil is rotated through 1.5 revolutions, and the external source of the magnetic field is turned off, in that order. Rank the emf induced in the coil at the instants marked A through K from the largest positive value to the largest-magnitude negative value. In your ranking.
At the moment t = 0, a 24.0-V battery is connected to a 5.00-mH coil and a 6.00- resistor. (a) Immediately thereafter, how does the potential difference across the resistor compare to the emf across the coil? (b) Answer the same question about the circuit several seconds later. (c) Is there an instant at which these two voltages are equal in magnitude? If so, when? Is there more than one such instant? (d) After a 4.00-A current is established in the resistor and coil, the battery is suddenly replaced by a short circuit. Answer parts (a), (b), and (c) again with reference to this new circuit.
The healing coils in a hair dryer are 0.800 cm in diameter, have a combined length of 1.00 m, and a total of 400 turns. (a) What is their total self-inductance assuming they act like a single solenoid? (b) How much energy is stored in them when 6.00 A flows? (c) What average emf opposes shutting them off if this is done in 5.00 ms (one-fourth at a cycle for 50 Hz AC)?
A solenoid 50 cm long is wound with 500 turns of wire. The cross-sectional area of the coil is 2.0 cm2. What is the self-inductance of the solenoid?
Using RHR-l, show that the emfs in the sides of the generator loop in Figure 23.23 are in the same sense and thus add.
A stationary coil is in a magnetic field that is changing with time. Does the emf induced in the coil depend on the actual values of the magnetic field?
A coil of 1000 turns encloses an area of 25 cm2. It is rotated in 0.010 s from a position where its plane is perpendicular to Earth’s magnetic field to one where its plane is parallel to the field. If the strength of the field is 6.0 x I0 T. what is the average emf induced in the coil?