Question

One sine wave has a positive peak at 75⁰, and another has a positive peak at 100⁰. How much is first sine wave shifted in phase from the 0⁰ reference?

(a) leads reference angle by 10⁰

(b) lags reference angle by 10⁰

(c) leads reference angle by 15⁰

(d) lags reference angle by 15⁰

This question was addressed to me in exam.

My doubt stems from Phase Relation in a Pure Resistor topic in chapter Introduction to Alternating Currents and Voltages of Network Theory

Answer 1

Correct choice is (c) leads reference angle by 15⁰

Easy explanation: As first sine wave has a positive peak at 75⁰, and another has a positive peak at 100⁰. First sine wave leads reference angle by 15⁰ from the 0⁰ reference.