L, C and R denote inductance, capacitance and resistance respectively. Which combination has the dimensions of frequency?

1/(RC) and R/L
1/sqrt(RC) and sqrt(R/L)
sqrt(LC)
C/L

Correct answer: 1/(RC) and R/L

Solution

RC has dimensions of time (RC circuit time constant), so 1/(RC) has dimensions of frequency (1/time). L/R is the time constant of an LR circuit, so R/L also has dimensions of frequency. Both 1/(RC) and R/L have dimensions of 1/time = frequency.

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