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Question: 

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 $\vec{B}$, which is horizontal, perpendicular to the wire, and of magnitude $5.0 \times 10^{-5} \textrm{ T}$. What current would the wire carry? Does the answer seem feasible? Explain briefly.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$1400 \textrm{ A.}$ 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

(3:37)

Chapter 20, Problem 8 is solved.

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