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MDCAT · Physics · Parcha original · Sample

If the distance between two point charges is doubled, the electric force between them becomes:

  1. A. Half
  2. B. One quarter✓ Correct answer
  3. C. Double
  4. D. Four times

Explanation

Coulomb's law: F = kq₁q₂/r². Doubling r multiplies r² by 4, so the force falls to one quarter.

کولمب کا قانون: F = kq₁q₂/r²۔ فاصلہ دگنا کرنے سے r² چار گنا ہوتا ہے، اس لیے قوت ایک چوتھائی رہ جاتی ہے۔