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A tunnel is dug along a chord of the earth. a perpendicular distance `R/2` from the earth\'s centre is dropped. The wall of the tunnel may be assumed to be frictionless. Find the force exerted by the wall on a particle of mass m when it is at a distance x from the centre of the tunnel.

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The correct Answer is:
`(GM_(e )m)/(2R^(2))`
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