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21_Coulombs_Law

# 21_Coulombs_Law - Problem-Solving Strategy Coulombs Law...

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Problem-Solving Strategy Coulomb’s Law IDENTIFY the relevant concepts: Coulomb’s law comes into play whenever you need to know the electric force acting between charged particles. SET UP the problem using the following steps: 1. Make a drawing showing the locations of the charged particles and label each particle with its charge. This step is particularly important if more than two charged particles are present. 2. If three or more charges are present and they do not all lie on the same line, set up an xy -coordinate system. 3. Often you will need to find the electric force on just one particle. If so, identify that particle. EXECUTE the solution as follows: 1. For each particle that exerts a force on the particle of interest, calculate the magnitude of that force using Eq. (21.2). 2. Sketch the electric force vectors acting on the particle(s) of interest due to each of the other particles (that is, make a free-body diagram). Remember that the force exerted by particle 1 on particle 2 points from particle 2 toward

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21_Coulombs_Law - Problem-Solving Strategy Coulombs Law...

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