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(B) The time constant of an $RC$ circuit is given by the product of resistance $R$ and capacitance $C$.Dimensional formula of resistance $R$ is $[R] =

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$[M^0 L^0 T^1 A^0]$

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(B) The time constant of an $RC$ circuit is given by the product of resistance $R$ and capacitance $C$.Dimensional formula of resistance $R$ is $[R] = [M L^2 T^{-3} A^{-2}]$.Dimensional formula of capacitance $C$ is $[C] = [M^{-1} L^{-2} T^4 A^2]$.Multiplying these dimensions: $[RC] = [M L^2 T^{-3} A^{-2}] 	imes [M^{-1} L^{-2} T^4 A^2]$.$[RC] = [M^{1-1} L^{2-2} T^{-3+4} A^{-2+2}] = [M^0 L^0 T^1 A^0]$.Thus,the dimensions of $RC$ are equivalent to time $T$.

If $C$ and $R$ represent capacitance and resistance respectively,then the dimensions of $RC$ are

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