A +30 µC charge is placed 56 cm from an identical +30 µC charge. How much work would be required to move a +0.50 µC test charge from a point midway between them to a point 14 cm closer to either of the charges?
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A +30 µC charge is placed 56 cm from an identical +30 µC charge. How much work would be required to move a?
F = kqQ/r², q = +0.5 µC, Q = +30 µC
F(net) = (8.988x10^9) (0.5x10^-6) (30x10^-6) (1/(0.56-0.14)² - 1/(0.56+0.14)² )
= 0.489 N
W = Fd = (0.489)(0.14) = 0.06848 Joules
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