In a new system of units, energy density and power are taken as fundamental units, then the dimensional formula of universal gravitational constant G will be?
To represent gravitational constant G in dimensions of a new system of units where energy, power and density are fundamental units, we first decide the representation of new fundamental units, [ ] represents dimension.
[Energy] = E
[Power] = P
[Density] = D
In standard system of mass, length, time and ampere:
…..1 (
)
…..2 (
)
…..3 (
)
Now,
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..(Putting 1, 2, 3 in 4)
Now, we also know that
…..5
(Since,
, or
)
Comparing 4 and 5, we get
…..6
…..7
…..8
Solving equations 6, 7 and 8, we get:
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So,
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