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A tunnel is dug along a diameter of the ...

A tunnel is dug along a diameter of the earth. Find the force on a particle of mass m placed in the tunnel at a distance x from the centre.

A

`(GM_(e)m)/R_(e)^(3)x`

B

`(GM_(e)m)/R_(e)^(2)x`

C

`(GM_(e)m)/x^(2)`

D

`(GM_(e)m)/((R_(e)+x)^(2))`

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The correct Answer is:
A
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