Please note that at 0:39 in the video Mr. Dychko mistakenly says "times ten to the minus four", but in fact it should be "times ten to the minus seven". The calculations are nevertheless correct as shown.

Giancoli 7th Edition, Chapter 20, Problem 26 solution video poster

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COMMENTS

By ZreLL on Sun, 9/30/2018 - 4:17 PM

There is a mistake in the video. Although the text is correct when talking about the permeability constant you say 4pi x 10^-4 as the text shows, the correct number is 4pi x 10^-7

By Mr. Dychko on Thu, 10/18/2018 - 8:10 PM

Thank you very much ZreLL, I've added a note to the quick answer mentioning this error.
All the best,
Mr. Dychko

By ZreLL on Thu, 10/18/2018 - 8:14 PM

Your welcome. Thank you for all the help with physics.

By Mr. Dychko on Thu, 10/18/2018 - 8:21 PM

You're welcome! I'm really glad the videos are helpful!

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If an electric wire is allowed to produce a magnetic field no larger than that of the Earth (0.50×10−4 T)(0.50 \times 10^{-4} \textrm { T})(0.50×10−4 T) at a distance of 12 cm from the wire, what is the maximum current the wire can carry?

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If an electric wire is allowed to produce a magnetic field no larger than that of the Earth $(0.50 \times 10^{-4} \textrm { T})$ at a distance of 12 cm from the wire, what is the maximum current the wire can carry?