MHT CET · Physics · Electrostatics
Two-point charges \(+Q\) and \(+q\) repel each other with a force of \(100 \mathrm{~N}\). Keeping the distance between them unchanged, if \(Q\) is increased by \(10 \%\) and \(q\) is decreased by \(q\) the force of repulsion between them will.
- A decrease by \(10 \mathrm{~N}\)
- B decrease by \(1 \mathrm{~N}\)
- C increase by \(10 \mathrm{~N}\)
- D remain same
Answer & Solution
Correct Answer
(B) decrease by \(1 \mathrm{~N}\)
Step-by-step Solution
Detailed explanation
Given, \(100 \mathrm{~N}=\frac{k Q q}{r^2}\) and \(F=\frac{k(1.1 Q)(0.9 q)}{r^2}\)
Taking the ratio of above two equations:
\(F=99\)
Taking the ratio of above two equations:
\(F=99\)
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