InterviewSolution
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InterviewSolution
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In the following diagrams a particle with small charge `-q` is free to move up or down , but not sideways near a larger fixed charge `Q`.The small charge is in equilibrium because in the positions shown ,the electrical upward force is equal to the weight of the particle .Which statement os true? A. In fig.`(A) ,-q` is in stable equilibriumB. In fig.`(A) ,-q` is in neutral equilibriumC. In fig.`(B) ,-q` is in stable equilibriumD. Neither in fig.`A` nor in `B,-q` is in stable equilibrium |
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Answer» Correct Answer - 3 In first diagram , if we displace `-q` in downward direction , electric force on it decreases , `mg != F_(e )` , it will move down (unstable equilibrium). In second diagram , if we displace `-q` in downward direction , electric force on it increases , `F_(e ) gt mg` , net force restores `-q` to its original position (unstable equilibrium). |
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