Coulomb's Law (Electric Force) Video Lessons

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Problem: Pictured on the right are three-point charges Q1 = 21.4 μC, Q2 = -30.6 μC, and Q3 = 57.3 μC arranged according to the figure on the right. A fourth point charge is located at point A with a charge of QA = 13.5 μC. Calculate the magnitude of the net force on the charge at point A. The answer should be in N.

FREE Expert Solution

Coulomb's law:

F=kq1q2r2, where k is the coulomb's constant and r is the separation between the two charges. 

The magnitude of the net force:

Fnet=Fx2+Fy2

k = 9 × 109 N·m2/C2

The force due to charge Q1 is:

F1A=kQ1QAr1A2=(9×109)(21.4×10-6)(13.5×10-6)(80.1×10-2)2

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Problem Details

Pictured on the right are three-point charges Q1 = 21.4 μC, Q2 = -30.6 μC, and Q= 57.3 μC arranged according to the figure on the right. A fourth point charge is located at point A with a charge of QA = 13.5 μC. Calculate the magnitude of the net force on the charge at point A. The answer should be in N.

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