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Three point charges +1, −3, and +5 (in arbitrary units) are placed in a closed system. What is the total charge of the system?
A+9 units
B+1 unit
C+3 units
D+5 units
Answer & Solution
Correct answer: C. +3 units
Charges are scalars that add algebraically (with sign): (+1) + (−3) + (+5) = +3. This is the additivity of charge property.
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