MP Board · Class 12 · Physics · Alternating CurrentThe current flowing in an AC circuit is called 'Wattless Current' when the phase difference between voltage and current is:
Step-by-Step Solution
Average power $P_{avg} = V_{rms} I_{rms} \cos\phi$. When $\phi = \frac{\pi}{2}$ ($90^\circ$), $P_{avg} = 0$. In this condition, no power is consumed, and the current is called wattless current.
Detailed Options Breakdown
Option : $0$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Alternating Current.
Option 1: $\frac{\pi}{4}$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Alternating Current.
Option 2: $\frac{\pi}{2}$ (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: $\pi$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Alternating Current.
💡 Study Guide: This question tests core syllabus concepts from Alternating Current. For formulas, key summaries, and mock exam reference guides, read the full Alternating Current Revision Notes.