Question Details

If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of :

Options

A

[M] [L0] [T0]

B

[M2] [L−2] [T−1]

C

[M2] [L−1] [T0]

D

[M] [L−1] [T−1]

Show Answer

Correct Answer :

Option C

[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.

E=ML2T-2

Next, obtain the dimensions of G from Newton’s law of universal gravitation:

F=GM1M2r‑2

Re‑arranging gives G = F r² ⁄ (M₁ M₂). The dimensions of force are mass × length × time⁻²:

F=MLT-2

Therefore:

G=FL2M2=M-1L3T-2

Now form the ratio E ⁄ G:

EG=M1L2T-2÷M-1L3T-2

Dividing by a fraction is the same as multiplying by its reciprocal:

EG=M1L2T-2·M1L-3T2

Combine the exponents for each fundamental dimension:

M2L-1T0

Thus the dimensional formula of E ⁄ G is [M²] [L⁻¹] [T⁰], which matches the given correct option.

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