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QPage 329: Q4: HC Verma: Concepts of Physics - Volume 2 Alternating Current Page 329: Q4 Solution: An AC source is rated 220 V, 50 Hz. The average voltage is…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the average of a sinusoidal AC voltage is always zero, overlooking that zero average holds only over an integer number of full periods; over a partial interval like 0.01 s (half a 50 Hz cycle) the average can be non‑zero depending on the phase of the chosen window.

An AC source is rated 220 V, 50 Hz. The average voltage is calculated in a time interval of 0.01 s. It

Multiple Choice Options

  • A must be zero
  • B may be zero
  • C is never zero
  • D is 220/2) V220/\sqrt{2}) \text{ V}

Step-by-Step Verified Solution

**Answer:** (b) may be zero. **Step-by-Step Explanation:** The average of an AC voltage over a full number of cycles is zero. Over 0.01 s (half a cycle for 50 Hz), the average is not zero. So it may or may not be zero depending on the interval.

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