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

KEAMKEAM 2016Physical World, Units and Measurements

Solution:

Dipole moment, $[P]=q \cdot d=I T L$
Electric flux, $[\phi]=E \cdot d s=[M L^{3} I^{-1} T^{-3}]$
Electric field, $[E]=\frac{k \cdot q}{r^{2}}=[ ML I^{-1} T^{-3}]$