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A uniform electric field E = - 1000 N/C i is shown in the figure below. The valu

ID: 1424108 • Letter: A

Question

A uniform electric field E = - 1000 N/C i is shown in the figure below. The value for L = 1.0 cm. L What is the difference in electric potential, Delta V = V_B - V_A, between points A and B? What is the difference in electric potential, Delta V = V_C - V_B, between points C and B? What is the difference in electric potential, Delta V = V_C - V_A, between points C and A? While we only explored differences in voltage above, also contemplate: What voltage value(s) could you assign to point A? Does convention help narrow it down?

Explanation / Answer

(a) Since AB is perpendicular to the direction of electric field, A and B are equipotential points. So, VB - VA = 0

(b) VC - VB = E * dCB = -1000 * (4 * 1 * 10-2) = -40 V

(c) Since VA = VB, we have,

VC - VA = VC - VB = -40 V

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