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A non-polar molecule is located at the axis of a thin uniformly charged ring of radius R. At what distance x

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A non-polar molecule is located at the axis of a thin uniformly charged ring of radius R. At what distance x from the ring's centre is the magnitude of the force F acting on the given molecule 

(a) equal to zero; (b) maximum? 

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The electric field E at distance x from the centre of the ring is,

The induced dipole moment is 

The force on this molecule is

(on either side), 

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