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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
20
Magnetism
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20-3: Force on Electric Current in Magnetic Field
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20-4: Force on Charge Moving in Magnetic Field
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20-5 and 20-6: Magnetic Field of Straight Wire, Force between Two Wires
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20-7: Solenoids and Electromagnets
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20-8: Ampère's Law
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20-9 and 20-10: Torque on Curent Loop, Motors, Galvanometers
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20-11: Mass Spectrometer
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20-12: Ferromagnetism, Hysteresis
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 28
Q

A vertical straight wire carrying an upward 28-A current exerts an attractive force per unit length of 7.8×10−4 N/m7.8 \times 10^{-4} \textrm{ N/m} on a second parallel wire 9.0 cm away. What current (magnitude and direction) flows in the second wire?

A
13 A upward13 \textrm{ A upward}
Giancoli 7th Edition, Chapter 20, Problem 28 solution video poster
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COMMENTS
By eptrottier on Tue, 7/25/2017 - 7:38 PM

where do you get the formula in the blue?

By Mr. Dychko on Thu, 8/31/2017 - 7:54 PM

Hi eptrottier, that formula is on page 571, labelled 20-7. It's the force between two parallel current carrying wires.

All the best,
Mr. Dychko

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