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# Solution: Determine the vector force exerted on QA by QB

#### Problem Statement: Electromagnetics

Coulomb’s Law Problem Solving

A charge QA = -20 ฮผC is located at A(-6, 4, 7), and a charge QB = 50 ฮผC is B(5, 8, -2) in free space. If distances are given in meters, determine the vector force exerted on QA by QB.

A. 25.16ax + 11.18ay – 30.76az

B. 30.76ax – 11.18ay โ 26.89az

C. 30.76ax + 11.18ay โ 25.16az

D. -20.76ax + 11.18ay + 25.16az

#### Problem Answer:

The vector force exerted on QA by QB is equal to 30.76ax + 11.18ay โ 25.16az mN.

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