Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
21
Electromagnetic Induction and Faraday's Law
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21-1 to 21-4: Faraday's Law of Induction
21-5: Generators
21-6: Back EMF and Torque
21-7: Transormers
21-10: Inductance
21-11: Magnetic Energy Storage
21-12: LR Circuit
21-13: AC Circuits and Reactance
21-14: LRC Circuits
21-15: Resonance in AC Circuits

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 16
Q

In Fig. 21–11, the moving rod has a resistance of 0.25  Ω0.25 \; \Omega and moves on rails 20.0 cm apart. The stationary U-shaped conductor has negligible resistance. When a force of 0.350 N is applied to the rod, it moves to the right at a constant speed of 1.50 m/s. What is the magnetic field?

A conducting rod is moved to the right on a U-shaped conductor in a uniform magnetic field B that points out of the page. The induced current is clockwise.
Figure 21-11 (a) A conducting rod is moved to the right on a U-shaped conductor in a uniform magnetic field B\vec{B} that points out of the page. The induced current is clockwise.
Upward force on an electron in the metal rod (moving to the right) due to B pointing out of the page; hence electrons can collect at the top of the rod, leaving + charge at the bottom.
Figure 21-11 (b) Upward force on an electron in the metal rod (moving to the right) due to B\vec{B} pointing out of the page; hence electrons can collect at the top of the rod, leaving + charge at the bottom.
A
1.2 T1.2 \textrm{ T}
Giancoli 7th Edition, Chapter 21, Problem 16 solution video poster
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