Two long thin charged rods with charge density \( \lambda \) each are placed parallel to each ot...
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7Two long thin charged rods with charge density \( \lambda \) each are placed parallel to each other at a distance \( d \) apart. The force per unit length exerted on one rod by the other will be \( \left(k=1 / 4 \pi \varepsilon_{0}\right) \)
(A) \( \frac{k 2 \lambda}{d} \)
(B) \( \frac{k 2 \lambda^{2}}{d} \)
(C) \( \frac{k 2 \lambda}{d^{2}} \)
(D) \( \frac{k 2 \lambda^{2}}{d^{2}} \)
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