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Define 'G'. What are the units and dimen...

Define 'G'. What are the units and dimensions of 'G' ?

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If `m_(1)=m_(2)=1andr=1`
F = G
Universal gravitational constant is defined as the force of attraction between two bodies of unit mass each and are placed unit distance apart.
Unit of G: `Nm^(2)kg^(-2)`
Dimension of G: `M^(-1)L^(3)T^(-2)`
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