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Electric Field: Solving for Force

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Hi, I need some assistance understanding how to solve the following problem.

Problem: A +5.0 micro-Coulomb charge experiences a 0.20 N force in the positive y direction. If this charge is replaced with a -2.7 micro-Coulomb charge, what force will it experience?

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This solution provides an explanation of the steps needed to solve for this physics based problem. The formulas required for solving this problem are also included. This solution is easy to interpret and should definitely improve one's understanding of problem's that are of this nature.

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Solution: The force between two charges is given by the formula, F = k q1*q2/r^2

Here we have, F= 0.2N, q1=+5*10^-6C
Thus we can write, 0.2 = k * 5*10^-6 * ...

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