Question

Particles of charge +65, +48, and −95 μC are placed in a line (Figure 1). The center one is L = 50 cm from each of the others. Calculate the net force on the left charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left. Calculate the net force on the center charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left. Calculate the net force on the right charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left.

Answer 1

Force F = vector Σ kQq / d²

A) Accounting for the push/pull due to sign,
F = 8.99e9N·m²/C² * 65e-6C * (-48e-6C/(0.50m)² + 95e -6C/(1.00m)²)
F = -57 N ◄ that is, to the left

B) F = 8.99e9N·m²/C² * 48e-6C * (65e-6C + 95e-6C) / (0.50m)²
F = 280 N ◄ to the right

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