# Find the electric force exerted on one sphere by the other.

## Homework Statement

002 (part 1 of 2) 2.0 points

Two identical conducting spheres are placed with their centers 0.3 m apart. One is given
a charge of +1.3 × 10^−8 C and the other a charge of 1 × 10^−9 C. Find the electric force exerted on one sphere by the other. The value of the Coulomb
constant is 8.98755 × 109 N · m^2/C^2.

003 (part 2 of 2) 2.0 points

The spheres are connected by a conducting wire. After equilibrium has occurred, find the
electric force between the two spheres.

Fe=Cq1q2/r2

## The Attempt at a Solution

So, I input all of the numbers into the formula as shown, but the homework system won't accept the answer. Any clue as to why?

As to the second part, I assume I total the charges and divide it by two, then use that in the equation as both charges...Right?

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rl.bhat
Homework Helper
Your approach to the second part is correct.

For the first part, are you supposed to enter the magnitude of the electric force or the vector notation of the electric force? If you're entering that correctly, try not rounding your numbers- online homework systems can be very fickle (and annoying). Failing that, your calculations could just be wrong so showing them would be helpful.

I did 8.98755x10^9*1.3x10^-8*1x10^-9 / .3^2. I get 1.29820166666e-6. I don't know what's wrong there.

And part two is also incorrect. I'm at a loss.

cepheid
Staff Emeritus