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A, B, C and D are four different physical quantities having different dimensions. None of them is dimensionless. But we know that the equation
AD = C In(BD) holds true Then which of the combination is not a meaningful quantity ?
Answers (1)
the term inside the log should be dimensionless, so BD is dimensionless
so dimension of [B]=1/[D]
and [AD]=[C]
So dimension of [A] is not equal to [C], so we cannot subtract A and C