CUET · PHYSICS · PYQ PAPER 2023
Two point charges \(+3 \mu C\) and \(-8 \mu C\) attracts each other with a force of 40 N , when separated by finite distance d . If a charge of \(+5 \mu C\) is added to each of them, then the force between them will become:
- A 160 N
- B 100 N
- C 80 N
- D 40 N
Answer & Solution
Correct Answer
(D) 40 N
Step-by-step Solution
Detailed explanation
\(|q_1 q_2| = |(3)(-8)| = 24\) \(q_1' = 3 + 5 = 8 \, \mu C\) \(q_2' = -8 + 5 = -3 \, \mu C\) \(|q_1' q_2'| = |(8)(-3)| = 24\) \(F_2 = F_1 \frac{|q_1' q_2'|}{|q_1 q_2|} = 40 \, N \times \frac{24}{24}\) \(F_2 = 40 \, N\)
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