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Question

A charge q1 exerts some force on a second charge q2. If a third charge q3 is brought near, the force of q1 exerted on q2:

A
decreases
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B
increases
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C
remains unchanged
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D
increases if q3 is of same sing as q1 and decreases if q3 is of opposite sign.
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Solution

The correct option is C remains unchanged
According to the principle of superposition,
The force between any two charged particles is independent of all other charges in the universe.

The force of q1 or q2 is not affected by q3.
Note that, however, resultant force on
q2 will be affected.

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