Clever farmers with power lines crossing their land have been known to steal power by stringing wire near the power line and making use of the induced current. At least one such crime went to court and resulted in a conviction—despite the defense’s claim that the defendant didn’t touch the lines. Figure 27.42 shows a possible crime scene, with a rectangular wire loop mounted in a vertical plane beneath a power line. The power line carries a current of 104 A, alternating sinusoidally at 60 Hz.
FIGURE 27.42 Crime scene for Passage Problems 80–83
80. If the loop were mounted in a horizontal rather than vertical plane at the same distance from the power line, the induced emf would
- a. increase slightly.
- b. decrease slightly.
- c. remain the same.
- d. become essentially zero.
Want to see the full answer?
Check out a sample textbook solutionChapter 27 Solutions
Essential University Physics: Volume 2 (3rd Edition)
Additional Science Textbook Solutions
Tutorials in Introductory Physics
Essential University Physics: Volume 1 (3rd Edition)
The Cosmic Perspective (8th Edition)
Sears And Zemansky's University Physics With Modern Physics
The Cosmic Perspective Fundamentals (2nd Edition)
Conceptual Physics (12th Edition)
- Show that Equation 32.28 in the text Ls Kirchhoffs loop rule as applied to the circuit in Figure P32.56 with the switch thrown to position b.arrow_forwardA rectangular conducting loop is placed near a long wire carrying a current I as shown in Figure OQ23.5. If I decreases in time, what can be said of the current induced in the loop? (a) The direction of the current depends on the size of the loop. (b) The current is clockwise. (c) The current is counterclockwise. (d) The current is zero. (e) Nothing can be said about the current in the loop without more information.arrow_forwardReview. Figure P31.31 shows a bar of mass m = 0.200 kg that can slide without friction on a pair of rails separated by a distance = 1.20 m and located on an inclined plane that makes an angle = 25.0 with respect to the ground. The resistance of the resistor is R = 1.00 and a uniform magnetic field of magnitude B = 0.500 T is directed downward, perpendicular to the ground, over the entire region through which the bar moves. With what constant speed v does the bar slide along the rails?arrow_forward
- A coil with a self-inductance of 3.0 H and a resistance of 100 2 carries a steady current of 2.0 A. (a) What is the energy stored in the magnetic field of the coil? (b) What is the energy per second dissipated in the resistance of the coil?arrow_forwardA thin wire = 30.0 cm long is held parallel to and d = 80.0 cm above a long, thin wire carrying I = 200 A and fixed in position (Fig. P30.47). The 30.0-cm wire is released at the instant t = 0 and falls, remaining parallel to the current-carrying wire as it falls. Assume the falling wire accelerates at 9.80 m/s2. (a) Derive an equation for the emf induced in it as a function of time. (b) What is the minimum value of the emf? (c) What is the maximum value? (d) What is the induced emf 0.300 s after the wire is released? Figure P30.47arrow_forwardA bicycle generator rotates at 1,800 rad/s, producing a 15.5 V peak emf. It has a 45-turn, 1.00 by 3.00 cm rectangular coil in a 0.640 T field. It is driven by a 1.48 cm diameter wheel that rolls on the outside rim of the bicycle tire. (a) What is the velocity of the bicycle? (Enter the magnitude in m/s.) m/s (b) What is the maximum emf (in V) of the generator when the bicycle moves at 10.0 m/s, noting that it was 15.5 V under the original conditions? V (c) If the sophisticated generator can vary its own magnetic field, what field strength (in T) will it need at 5.00 m/s to produce a 9.00 V maximum emf?arrow_forward
- A circuit is made with a resistor of resistance 25 ohms and a movable bar with length 15 cm moving to the left with speed 8 m/s. The whole circuit is in a magnetic field B = 1.5 T (into page). Use this set up to answer the following questions. What is the magnitude (no negative answers) of the power delivered to the resistor in watts? Answer to 4 decimal places.arrow_forwardBelow is a Motional EMF problem with a sliding, conducting bar connecting a wire loop within a magnetic field of magnitude B = 0.640 T (and the direction shown below). This bar is being pulled to the right (as shown below) at a constant velocity v= 25.00 m/s. There is a resistance in the wire connecting the bar ends of R = 6.25 Ohms. There is no power source beyond the force pulling on the bar. The height listed shows the space between the wires as a value of H = 0.300 m. Magnetic Field (out of the page) Force What is the induced current within the closed loop in this system? You can assume the only resistance comes from the listed resistor. Make sure to put a negative with your answer for clockwise current. Heightarrow_forwardA car generator turns at 400 rpm when the engine is idling. Its 300 turn, 5.1 cm by 8.15 cm rectangular coil rotates in an adjustable magnetic field so that it can produce sufficient voltage even at low rpms. What is the field strength (in T) needed to produce a 27 V peak emf?arrow_forward
- A square wire with 2 m sides is perpendicular to a uniform magnetic field, with half the area of the loop in the field as shown in the figure. The loop contains a 20 V battery with negligible resistance. If the magnitude of the field varies with time according to B = 1.0410 - 0.8400 t with B in teslas and t in seconds, what is the total emf in the circuit?arrow_forwardA current runs in a long solenoid of a radius 3 cm and 437 turns per meter. The current in the solenoid is increased at a rate of 2 A/s. A single circular loop of wire of radius 5 cm and resistance 2 Ω surrounds the solenoid. Find the electrical current induced in the single loop. Give your answer in units of microamperes.arrow_forwardA dc motor with its rotor and field coils connected in series has an internalresistance of 2.00 Ω. When running at full load on a 120 V line, itdraws a 4.00 A current. What is the emf in the rotor?arrow_forward
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning