two point charges of 1uc and -0.25uc
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two point charges of 1uc and -0.25uc
two point charges of 1uc and 4uc
two point charges of +2uc and +6uc
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two point charges of 5uc and 20uc
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two point charges q1 10uc
two charges each of 1uc
three point charges q1 1uc q2 -2uc
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a point charge of 12uc
two point charges of 1uc and -0.25uc, two point charges of 1uc and 4uc, two point charges of +2uc and +6uc, two point charges of 100uc and -4uc, two point charges of 5uc and 20uc, two point charges 4uc and -2uc, two positive charges of 1uc and 2uc, two point charges 100uc and 5uc, two point charges 2uc and 8uc, two point charges +3uc and +8uc, two charges 2uc and 1uc, two point charges 3uc and -3uc, two point charges q1 2uc, two point charges q1 10uc, two charges each of 1uc, three point charges q1 1uc q2 -2uc, two charges 2uc and -2uc, three point charges of 2uc -3uc, a point charge of 12uc