1.

The dimensional formula for permeability of free space, `mu_(0)` isA. `[MLT^(-2)A^(-2)]`B. `[ML^(-1)T^(2)A^(-2)]`C. `[ML^(-1)T^(-2)A^(2)]`D. `[MLT^(-2)A^(-1)]`

Answer» Correct Answer - A
From Biot-Savart law
`dB - (mu_(0))/(4pi) (Idlsin theta)/(r^(2))`
`Idl =` current element
`r =` displacement vector
`mu_(0) = (4pi^(2)(dB))/(Idl sin theta) =([L^(2)][MT^(-2)A^(-1)])/([A][L]) = [MLT^(-2)A^(-2)]`


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