If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of :
Correct Answer :
[M2] [L−1] [T0]
[M2] [L−1] [T0]
Solution :
We are asked to find the dimensional formula of the ratio E ⁄ G, where E is energy and G is the gravitational constant.
First, write down the dimensions of energy.
Next, obtain the dimensions of G from Newton’s law of universal gravitation:
Re‑arranging gives G = F r² ⁄ (M₁ M₂). The dimensions of force are mass × length × time⁻²:
Therefore:
Now form the ratio E ⁄ G:
Dividing by a fraction is the same as multiplying by its reciprocal:
Combine the exponents for each fundamental dimension:
Thus the dimensional formula of E ⁄ G is [M²] [L⁻¹] [T⁰], which matches the given correct option.
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