Electric Force charge magnitude

AI Thread Summary
To find the magnitude of the second charge, the formula F = k(q1)(q2)/r^2 is used, where F is the force, k is Coulomb's constant, q1 is the first charge, and r is the distance between the charges. The calculation shows that q2 equals 25 nC when substituting the known values into the equation. The solution setup appears correct, and using nanoCoulombs (nC) is standard in charge measurements. The participant expresses uncertainty about using nano numbers, but this unit is commonly accepted in physics. The calculation confirms the second charge's magnitude as accurate.
Octoshark
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Homework Statement



A 1.0-C charge is 15 m from a second charge, and the force between them is 1.0 N.
What is the magnitude of the second charge?

Homework Equations



F = k(q1)(q2)/r^2

The Attempt at a Solution



F = k(q1)(q2)/r^2 need to solve for q2 so...

F(r^2)/k(q1) = q2

1N(225m)/(9x10^9)(1C) = 25nC

That is correct, right? I just wasn't sure because this is on my sample exam, but we never used nano numbers during class so I wanted to double check.
 
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Octoshark said:

Homework Statement



A 1.0-C charge is 15 m from a second charge, and the force between them is 1.0 N.
What is the magnitude of the second charge?

Homework Equations



F = k(q1)(q2)/r^2

The Attempt at a Solution



F = k(q1)(q2)/r^2 need to solve for q2 so...

F(r^2)/k(q1) = q2

1N(225m)/(9x10^9)(1C) = 25nC

That is correct, right? I just wasn't sure because this is on my sample exam, but we never used nano numbers during class so I wanted to double check.
though i didn't actually calculate it, your setup looks right. nC is a common measure of charge.
 

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