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JEE Advanced 2015Paper 1
Exam
JEE Advanced
Year
2015
Paper
Paper 1
Subject
Physics
Chapter
Electrostatics

JEE Advanced 2015 · Paper 1 · Physics · Electrostatics

The figures below depict two situations in which two infinitely...

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

Options

  1. ABoth charges execute simple harmonic motion
  2. BBoth charges will continue moving in the direction of their displacement
  3. CCharges +q+ q executes simple harmonic motion while charges −q- q continues moving in the direction of its displacement
  4. DCharge −q- q executes simple harmonic motion while charges +q+ q continues moving in the direction of its displacement

Correct answer

C. Charges +q+ q executes simple harmonic motion while charges −q- q continues moving in the direction of its displacement

Step-by-step solution

In first case if q is shifted towards one of the wires, its repulsive force will increase which will bring the charge back. In second case, in same type of displacement attractive force due to wire increases which will make it move further towards wire.
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