It has been determined that the phase shift of a given parallel RC circuit is lower than predicted. Which of the following most likely has caused this?
A)Resistance has decreased.
B)The function generator frequency control has been accidentally moved to a lower frequency.
C)The capacitance has decreased.
D)could be A or C

Question

Quizplus · Accepted Answer

The phase shift in a parallel RC circuit is given by the formula:

θ = arctan(1/RCω)

Where R is the resistance, C is the capacitance, and ω is the frequency of the input signal.

If the phase shift is lower than predicted, it means that the arctan function is producing a smaller output than expected, which could happen if the argument of the function (1/RCω) is smaller than expected.

A decrease in resistance or capacitance would both lead to a smaller argument of the function, thereby causing a smaller phase shift. Therefore, either A or C could be the cause of the lower-than-predicted phase shift.

It Has Been Determined That the Phase Shift of a Given