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A uniform thin rod of mass m and length ...

A uniform thin rod of mass `m` and length `R` is placed normally on surface of earth as shown. The mass of earth is `M` and its radius `R`. Then the magnitude of gravitational force exerted by earth on the rod is

A

`(GMm)/(4R^(2))`

B

`(GMm)/(2R^(2))`

C

`(4GMm)/(9R^(2))`

D

`(GMm)/(8R^(2))`

Text Solution

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The correct Answer is:
B
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