Question

When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

• A. increases
• B. decreases
• C. remains the same
• D. becomes erratic

Answer 1

Answer: (B)

decreases

Tangent of phase angle $\tan \varphi =\frac{X_C}{R}$ (for RC circuit)

Using $X_C=\frac{1}{wC}$

$⟹$ $\tan \varphi =\frac{1}{wCR}$

Thus if the frequency of the voltage applied to a series RC circuit is increased, the phase angle decreases.