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Use principle of homogenity of dimensio...

Use principle of homogenity of dimensions to find which one of the following relations is correct : (i) `T^2 =4pi^2r^2`
(ii) `T^2 =(4pi^2r^3)/(G)`
(iii) `T^2 = (4pi^2 r^3)/(GM)`

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The correct Answer is:
(iii) is correct
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