One way to write Coulomb's law is F=(k lQql)/(r^2) where F is the magnitude of the electric force, k is a constant, Q and q are the two electrical charges and r is the distance between them. Solve Coulomb's law for r.

Question

anonymous · Answer

Multiply both sides by r^2, to get it on the left.
Divide both by F, to get it on the right.

r^2 = etc.

r = sqrt(etc.)

you should finish it.

anonymous · Answer

i did it, and it gave me r=+,-(sqrt(k(Qq))/(sqrt(F)), however, the system still reads it as incorrect, is there i'm missing with the absolute value of “Qq”？

anonymous · Answer

r cannot be negative as it is a distance. Did you use |Qq| or (Qq)? Former is needed.

anonymous · Answer

i can not use capital Q, because wileyplus(the software) do not allow me to.

anonymous · Answer

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anonymous · Answer

You have the right formula for the answer.

anonymous · Answer

so, it's the system itself that is not accepting the answer?and not that my answer is incorrect?

anonymous · Answer

you forget the modulus inside sqrt

anonymous · Answer

so there it should be absolute value of q1q2?

anonymous · Answer

yes , imagine ,if the value of product were negative will give you an complex radius

anonymous · Answer

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anonymous · Answer

will that be the answer? sorry about all the questions, i don't want to submit the answer before it is right since i only have 1 more attempt left.