Two positively charged objects are separated by a large distance. One of the positively charged objects is replaced by a negatively charged object, and the two objects are moved closer to each other. Which of the following occurs in this situation?
A. The attractive force becomes a repulsive force, which increases as the objects move closer to each other.
B. The repulsive force becomes an attractive force, which increases as the objects move closer to each other.
C. The attractive force becomes a repulsive force, which decreases as the objects move closer to each other.
D. The repulsive force becomes an attractive force, which decreases as the objects move closer to each other.

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2014-06-22T18:46:24+08:00

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Same charges repel. So, positive + positive = repulsive force.
Opposite charges attract. Negative + positive = attractive force.
When two objects attract each other, they will move closer to each other. The closer they are, the stronger the force is.

Therefore, B. The repulsive force becomes an attractive force, which increases as the objects move closer to each other.
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