You have two metal spheres on insulating stands. You bring them each in turn near the ball of a positively charged electroscope. In each case the deflection of the leaves is reduced slightly. You then bring them each in turn near the ball of a negatively charged electroscope and find that sphere A causes the deflection to increase, whereas sphere B causes it to decrease. What can you say about the net charge on each of the two metal spheres?
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