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.
Comments
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)?
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.