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A positive point charge (q +9.51 x 10 BC) is surrounded by an equipotential surface A, which has a radius of r= 1.13 m. A positive
test charge (90+4.52 x 1011 C) moves from surface A to another equipotential surface B, which has a radius re. The work done by the
electric force as the test charge moves from surface A to surface B is WAB-8.42 x 10° J. Find re
ro

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