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Solve: The figures show 2 infinitely long lines of positive charge. +q is placed half way between them on the left and -q is placed half way between them on the right. If given a small displacement the correct statements are:
a) both charges execute simple harmonic motion
b) both charges will continue moving in the direction of their displacement
c) charge +q executes simple harmonic motion while -q continues moving in the direction of its displacement
d) charge -1 executes simple harmonic motion while +q continues moving in the direction of its displacement.

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