Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition

20-3: Force on Electric Current in Magnetic Field
20-4: Force on Charge Moving in Magnetic Field
20-5 and 20-6: Magnetic Field of Straight Wire, Force between Two Wires
20-7: Solenoids and Electromagnets
20-8: Ampère's Law
20-9 and 20-10: Torque on Curent Loop, Motors, Galvanometers
20-11: Mass Spectrometer
20-12: Ferromagnetism, Hysteresis

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 8

Suppose a straight 1.00-mm-diameter copper wire could just “float” horizontally in air because of the force due to the Earth’s magnetic field B\vec{B}, which is horizontal, perpendicular to the wire, and of magnitude 5.0×105 T5.0 \times 10^{-5} \textrm{ T}. What current would the wire carry? Does the answer seem feasible? Explain briefly.

1400 A.1400 \textrm{ A.} This is not realistic since thicker house wiring carries a maximum of 15 Amps safely. This wire would overheat and melt.
Giancoli 7th Edition, Chapter 20, Problem 8 solution video poster

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