Part A What is the electric potential at points A, B, and C in the figure? Assum

Question

Part A

What is the electric potential at points A, B, and C in the figure? Assume that q = 2.3 nC , r1 = 0.90 cm , and r2 = 2.4 cm . (Figure 1)

Enter your answers numerically separated by commas.

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Part B

What is the potential difference ?VAB?

Express your answer to two significant figures and include the appropriate units.

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Part C

What is the potential difference ?VBC?

Express your answer with the appropriate units.

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Explanation / Answer

A)

A and B are at equipotential surface
Va = Vb = K*q/r1
= (9*10^9)*(2.3*10^-9) / (0.9*10^-2) [since r = 0.9 cm = 0.9*10^-2 m]
= 2300 V

Vc = K*q/r2
= (9*10^9)*(2.3*10^-9) / (2.4*10^-2) [since r = 2.4 cm = 2.4*10^-2 m]
= 862.5 V
Answer: 2300,2300,862.5 V

B)
VAB = VA - VB = 2300 - 2300 = 0 V

C)
VBC = VB - VC = 2300 - 862.5 = 1437.5 V

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