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The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density λ are kept parallel to each other. In their resulting electric field, point charges q and –q are kept in equilibrium between them. The point charges are confined to move in the x direction only. If they are given a small displacement about their equilibrium positions, then the correct statements(s) is(are) +q λ λ x –q λ λ x v

1. Both charges execute simple harmonic motion.
2. Both charges will continue moving in the direction of their displacement.
3. Charge +q executes simple harmonic motion while charge –q continues moving in the direction of its displacement.
4. Charge –q executes simple harmonic motion while charge +q continues moving in the direction of its displacement. CAREER POINT CAREER POINT , CP Tower, IPIA, Road No.1, Kota (Raj.), : 0744-6630500 | www.ecareerpoint.com Email: info@cpil.in Page # 18 Paper-1 [ CODE – 05 ]

Correct answer: Charge +q executes simple harmonic motion while charge –q continues moving in the direction of its displacement.

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