College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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If the radius of a pair of Helmholtz coils is R, then the distance between the coils is:
1) 2R
2) R/2
3) R/4
4) R
5) 4R
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- Consult Multiple-Concept Example 11 for background material relating to this problem. A small rubber wheel on the shaft of a bicycle generator presses against the bike tire and turns the coil of the generator at an angular speed that is 45 times as great as the angular speed of the tire itself. Each tire has a radius of 0.326 m. The coil consists of 167 turns, has an area of 4.82 x 10-³ m², and rotates in a 0.0889-T magnetic field. The bicycle starts from rest and has an acceleration of +0.658 m/s². What is the peak emf produced by the generator at the end of 6.02 s? Number Unitsarrow_forwardA coil lies on a horizontal plane and the north pole of the magnet is pulled out of the coil with a quick movement in the direction shown in the diagram below. S O-x -X O +Y O -y O +z O-Z Find the direction of the induced current in the coil, when looking down on the coil from above, by answering the following questions. (a) What is the direction of the magnetic field due to the magnet in the center of the coil? O +x O decrease O remain the same (b) As the magnet is moved in the direction indicated, how will the magnetic flux in the coil change? O increase ооооо -X N (c) What is the direction of the induced magnetic flux in the coil? O +x +X O +Y O-y coil O +z y L -Z (d) What is the direction of the induced current in the coil when viewed from above the coil? O clockwise O counterclockwise O no currentarrow_forwardQUESTION 6 A long, thin wire is made into circular loop that lies flat in the x-y plane. A magnetic field points in the positive x (i) direction and is increasing. Which of the following statements are true regarding the resulting current in the loop? The current will flow clockwise O current will not flow O The current will alternate between clockwise and counter clockwise The current will flow counter clockwise QUESTION 7 A long, thin wire is made into a loop that lies flat in the x-y plane. A decreasing magnetic field points in the negative y (-j) direction. Which of the following statements are true regarding the resulting current in the loop. O current will alternate between clockwise and counter clockwise O The current flows clockwise O current will not flow The current flows counter clockwisearrow_forward
- In the figure, a 140-turn coil of radius 3.3 cm and resistance 6.9 Q is coaxial with a solenoid of 240 turns/cm and diameter 4.1 cm. The solenoid current drops from 1.7 A to zero in time interval At = 28 ms. What current is induced in amperes in the coil during At? Coil Solenoid Number i Unitsarrow_forwardThe diagram shows a loud speaker. The speaker consists of several parts: a strong permanent magnet in the shape of a letter "E" with two south poles at the top and bottom and a north pole in the middle, as shown, and a voice coil attached to the paper speaker cone. The voice coil is a coil of conducting wire with a current passing through it as shown. The voice coil and cone are free to move towards or away from the magnet. Draw in the direction of the force acting on the voice coil and cone below.arrow_forwardunstanding hardarrow_forward
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