Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 6th Edition
18
Electric Currents
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18-2 and 18-3: Electric Current, Resistance, Ohms' Law
18-4: Resistivity
18-5 and 18-6: Electric Power
18-7: Alternating Current
18-8: Microscopic View of Electric Current
18-10: Nerve Conduction

Problem 3
A
5.5×1011 A5.5 \times 10^{-11} \textrm{ A}
Giancoli 6th Edition, Chapter 18, Problem 3 solution video poster
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COMMENTS
By eupaulinha on Tue, 6/26/2012 - 4:27 AM

The problem says the charge is same as an electron's but positive. Shouldn't the answer also be raised to a positive power (5.5*10^11 A)?

By Mr. Dychko on Tue, 6/26/2012 - 2:57 PM

Hi eupaulinha,

Thanks a lot for the question. The answer is correct as shown. Compare 5.5*10^(-11) with -5.5*10^(-11). Both of these answers have a negative exponent for the scientific notation, but the first answer is a "positive number", whereas the second answers is a "negative number" because it's the sign in front of the 5.5 that matters. The negative exponent for 5.5*10^(-11) means the number is really small (55 picoAmps), but still positive.

Hope this helps, and let me know if you have other questions.

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