the distance between two point charges is 20 cm.if the distance is reduced to 10 cm.the coulomb's force would become_____

Question

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Answer 1

The Coulomb Force is an inverse square force; that is, it's proportional to 1/r² where r is the distance between the particles.

 

F = (1/4piε₀)*q₁q₂/r²

 

so when you cut the distance in half, the force increases by a factor of four: 1/(¹/₂)² = 1/(¹/₄) = 4.