A charge q1 exerts some force on a second charge q2. If a third charge q3 is bought near, the force of q1 exerted on q2: (a) decreases (b) increases (c) remains unchanged (d) increases if q3 is of same sign as q1 and decreases if q3 is of opposite sign

remains unchanged

As per the principle of superposition,

The force between any two charged particles is independent of all other charges in the universe. Hence, the force of q1 or q2 is not affected by q3. However resultant force on q2 will be affected

Therefore, the correct option is (c) 

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