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Question

Three particles, each of mass m, are placed at the vertices of an equilateral triangle of side a. The gravitational field intensity at the cenrtroid of the triangle is then

A
zero
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B
gm2a2
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C
2Gm2a2
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D
3Gm2a2
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Solution

The correct option is A zero

r=AO=BO=CO=l3

EA=Gmr2

=3Gml2 along OA
EB=3GMl

EC=3Gml

They are co planer and equal in magnitude and make an angle of 120

The resultant field is zero.
1080813_1132832_ans_eeacab2c49514161b93325b720d258c2.PNG

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