Consider three quantities x = E/B,y = sqrt{1/ | vedclass

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(D) $1$. The quantity $x = E/B$ represents the speed of an electromagnetic wave,which has dimensions $[LT^{-1}]$.$2$. The quantity $y = \sqrt{1/(\mu_0

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(D) $1$. The quantity $x = E/B$ represents the speed of an electromagnetic wave,which has dimensions $[LT^{-1}]$.$2$. The quantity $y = \sqrt{1/(\mu_0 \varepsilon_0)}$ is the speed of light in vacuum,which also has dimensions $[LT^{-1}]$.$3$. The quantity $z = l/(RC)$. Since the time constant $	au = RC$ has dimensions of time $[T]$,and $l$ is length $[L]$,the dimensions of $z$ are $[L/T] = [LT^{-1}]$.$4$. Since $x$,$y$,and $z$ all have dimensions of speed $[LT^{-1}]$,they all have the same dimensions.

Consider three quantities $x = E/B$,$y = \sqrt{1/(\mu_0 \varepsilon_0)}$ and $z = l/RC$. Here,$l$ is the length of a wire,$C$ is capacitance,and $R$ is resistance. All other symbols have standard meanings. Which of the following statements is correct?

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