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# Mass M is distributed uniformly over a rod of length L. Find the gravitational field at P at a distance a on perpendicular bisector.GM2a(L2+4a2)2GMa(L2+a2)none2GMa(L2+4a2)1/2

A
2GMa(L2+a2)
B
2GMa(L2+4a2)1/2
C
none
D
GM2a(L2+4a2)
Solution
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