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Change in Coulomb force when the charges or the distance change

This type of question, asked 5 times: 10 May 2023 S2, 15 May 2023 S2, 25 Apr 2025 S1, 20 Apr 2026 S1, 13 May 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    10 May 2023 S2

    36
    Two point charges (A and B) +4q+4q and −4q-4q are placed along a line separated by a distance 'r'. Force acting between them is F. If 25% of charge from point A is transferred to that at point B, the force between the charges now becomes

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  2. Question 2

    15 May 2023 S2

    30
    Two point charges +q1+q_1 and q2q_2 repel each other with a force of 100 N. q1q_1 is increased by 10% and q2q_2 is decreased by 10%. If they are kept at their original positions the change in the force of repulsion between them is

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  3. Question 3

    25 Apr 2025 S1

    43
    Two-point charges q1q_{1} and q2q_{2} are ' ll ' distance apart. If one of the charges is doubled and distance between them is halved. The magnitude of force becomes nn times, where nn is

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  4. Question 4

    20 Apr 2026 S1

    126
    Two point charges q1q_1 and q2q_2 are 'll' distance apart. If one of the charges is doubled and the distance between them is halved. The magnitude of the force becomes 'n' times, where 'n' is

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  5. Question 5

    13 May 2026 S1

    127
    Two point charges, +2C+2C and +6C+6C repel each other with a force of 1212N. If a charge of (−4C)(-4C) is given to each of these charges, the force now is

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