A positive point charge (q +9.51 x 108 C) is surrounded by an equipotential surface A, which has a radius of ra - 1.13 m. A positive test charge (90+4.52 x 10 11 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 × 10° J. Find re rei

A positive point charge (q +9.51 x 108 C) is surrounded by an equipotential surface A, which has a radius of ra - 1.13 m. A positive test charge (90+4.52 x 10 11 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 × 10° J. Find re rei