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Infinite number of spheres, each of mass...

Infinite number of spheres, each of mass m are placed on the X-axis at distances 1, 2, 4, 8, 16, . . . . meters from origin. The magnitude of the gravitational field at the origin is

A

`9000 N`

B

`12000 N`

C

`24000 N`

D

`36000 N`

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