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Consider the equipotential map shown below. Estimate the magnitude of the E-field at
point A. What direction is the E-field at point A? Rank the points A, B, and C in terms of
their E-field strength. Sketch the electric field lines. What is the sign of the charge (+ or
-) within the 30 V equipotential?
A •
10 cm
10 V
20 V
30 V

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