Answer :

We know that the phase angle ϕ is given by:

where XL is inductive reactance, XC is capacitive reactance and R is resistance.

Note that ϕ is measured is measured from current to voltage.

Now, and where f is frequency.

Initially, frequency is low. Hence, So, ϕ is negative. As frequency increases, we get and . When frequency is high, . Then, ϕ is positive.

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