Answer :

The formula used: For RC circuit the time constant is


Where t is the time constant


R is the resistance


C is the capacitance


Frequency


Then the frequency of the RC circuit is given by



For LR circuit the time constant is given by



Where is the time constant


L is the inductance


R is the resistance


Then the frequency is given by



Let’s take a multiplication of f1 and f2





This combination has a dimension of frequency.


The above combination has a dimension of frequency


i. RC has a frequency component


ii. LR has a frequency component


iii. f1f2 has a frequency component


Thus, option A, B and C are correct.

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