MHT CET · Physics · Electrostatics
Two-point charges +2 C and +6 C separated by distance ' r ' repel each other with a force of 18 N . If negative charge of 4 C is added to each of these charges, then the force experienced by them is
- A 6 N (attractive)
- B 12 N (attractive)
- C 6 N (repulsive)
- D 12 N (repulsive)
Answer & Solution
Correct Answer
(A) 6 N (attractive)
Step-by-step Solution
Detailed explanation
\(F_1 = k \frac{q_1 q_2}{r^2} \Rightarrow 18 = k \frac{(+2)(+6)}{r^2} \Rightarrow \frac{k}{r^2} = \frac{18}{12} = \frac{3}{2}\) \(q_1' = +2 - 4 = -2 \text{ C}\)
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