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  4. The set of physical quantities among the following which is dimensionally different is

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Q. The set of physical quantities among the following which is dimensionally different is

NTA AbhyasNTA Abhyas 2022

Solution:

Dipole moment, $\left[P\right]=q\cdot d=\left[ITL\right]$
Electric flux, $\left[\phi\right]=E.ds=\left[ML^{3} I^{- 1} T^{- 3}\right]$
Electric field, $\left[E\right]=\frac{k \cdot q}{r^{2}}=\left[MLI^{- 1} T^{- 3}\right]$