1.

3 particles each of mass m are kept at vertices of an equilateral triangle of side L. The gravitational field at centre due to these particles is                             [DCE 2005]              

A. Zero    
B.             \[\frac{3GM}{{{L}^{2}}}\]
C.             \[\frac{9GM}{{{L}^{2}}}\]
D.             \[\frac{12}{\sqrt{3}}\,\frac{GM}{{{L}^{2}}}\]
Answer» B.             \[\frac{3GM}{{{L}^{2}}}\]


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