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MHT CET 2026 (13 May, Shift 1) · Electric Charge & Coulomb's Law

Electric Charge & Coulomb's Law question from MHT CET 2026 (13 May, Shift 1)

Q12MHT CET 2026 · 13 MAY · SHIFT 1Medium

Electric Charge & Coulomb's Law

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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Answer: (b)

  1. F∝q1q2F \propto q_1q_2: initially 2×6=12⇒F=122\times6 = 12 \Rightarrow F = 12 N, so F=q1q2F = q_1q_2 (in N) at this distance.
  2. New charges: 2−4=−2 C2-4 = -2\ \text{C} and 6−4=+2 C6-4 = +2\ \text{C}.
  3. F′=∣−2×2∣=4F' = |-2\times2| = 4 N; unlike charges, so attractive.
  4. So the answer is (b) 4 N, attractive.
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