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Back to Coulomb's Law — Problem 2 · Task Set 4

Exercises: Coulomb's Law

Work through each section in order. Use $k = 9 \times 10^9$ N·m²/C² throughout. Show your work on all calculation problems.

Grade 11·20 problems·~35 min·OpenStax Physics (High School)·section·sec-18-2
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Fluency Practice

Use k=9×109k = 9 \times 10^9 N·m²/C². Show your work and state the direction of each force.

1.

Calculate the magnitude of the electric force between two charges: q1=+3×10−6q_1 = +3 \times 10^{-6} C and q2=+5×10−6q_2 = +5 \times 10^{-6} C, separated by r=0.30r = 0.30 m. Express your answer in newtons to two significant figures.