How Strong is the Attraction Between Two Humans After Electron Transfer?

[chukie]

Human tissue contains about 3*10^27 electrons per kg of material. Suppose two humans are located 1370 km apart and each has a mass of 60 kg. We now transfer 5*10^21 electrons from one person to the other. What will be the magnitude of the resulting attraction, rounded to the nearest Newton?

I used the equation F=kQ1Q2/r^2

except I am not sure if I used the right charges.
for Q1, i found it by ((3*10^27)(6)-(5*10^21))(1.6*10^-19)
and Q2: ((3*10^27)(6)+(5*10^21))(1.6*10^-19)

 

[Andrew Mason]

Human tissue contains about 3*10^27 electrons per kg of material. Suppose two humans are located 1370 km apart and each has a mass of 60 kg. We now transfer 5*10^21 electrons from one person to the other. What will be the magnitude of the resulting attraction, rounded to the nearest Newton?

I used the equation F=kQ1Q2/r^2

except I am not sure if I used the right charges.
for Q1, i found it by ((3*10^27)(6)-(5*10^21))(1.6*10^-19)
and Q2: ((3*10^27)(6)+(5*10^21))(1.6*10^-19)

Why are you using 3 x 10^27? Those electrons are balanced by an equal number of protons so there is 0 net charge. You want to find the net charge after the transfer of 5 x 10^21 electrons.

AM

 

[chukie]

oh okay, thanks! the answer i got now is more reasonable =)