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[" A particle of mass "m" ,charge - "Q" is constrained to move along the axis of a radius a.The ring "],[" carries a uniform charge density "+lambda" along its circumference.Initially,the particle lies in the plane of "],[" the ring at a point where no net force acts on it.The period of oscillation of the particle when it is "],[" displaced slightly from its equilibrium position is "],[[" (A) "T=4 pi sqrt((varepsilon_(0)ma^(2))/(lambda O))," (B) "T=2 pi sqrt((2 varepsilon_(0)ma^(2))/(lambda Q))," (C) "T=2 pi sqrt((4 varepsilon_(0)ma^(2))/(lambda Q))," (D) "T=2 pi sqrt((varepsilon_(0)ma^(2))/(2 lambda Q))]]

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