Question

In an RC series circuit R = 100 Ω and XC = 10 Ω. Which of the following is possible?

(a) The current and voltage are in phase

(b) The current leads the voltage by about 6°

(c) The current leads the voltage by about 84°

(d) The current lags the voltage by about 6°

Answer 1

The correct choice is (b) The current leads the voltage by about 6°

To explain: In RC circuit the current leads the voltage.

Or, θ =  \(\tan^{-1} \frac{10}{100}\)

This is nearly equal to 6°

Hence, the current lags the voltage by about 6°.