Which of the following pairs of quantities do | vedclass

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(C) $1$. Potential gradient $(dV/dx)$ has dimensions $[M L T^{-3} A^{-1}]$,and electric field $(E = F/q)$ also has dimensions $[M L T^{-3} A^{-1}]$.$2

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Light year,time period

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(C) $1$. Potential gradient $(dV/dx)$ has dimensions $[M L T^{-3} A^{-1}]$,and electric field $(E = F/q)$ also has dimensions $[M L T^{-3} A^{-1}]$.$2$. Torque $(	au = r 	imes F)$ and kinetic energy $(K = 1/2 mv^2)$ both have dimensions $[M L^2 T^{-2}]$.$3$. Light year is a unit of distance with dimensions $[L]$,while time period is a unit of time with dimensions $[T]$. Since $[L] 
eq [T]$,this pair does not have the same dimensions.$4$. Impedance $(Z)$ and reactance $(X)$ both have dimensions of resistance,$[M L^2 T^{-3} A^{-2}]$.Therefore,the correct option is $C$.

Which of the following pairs of quantities do not have the same dimensions?

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