Verified Solution • 2025–26 Session moderate

QPage 329: Q8: HC Verma: Concepts of Physics - Volume 2 Alternating Current Page 329: Q8 Solution: Transformers are used ______.

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistakenly believe transformers can step up or down DC voltage; however, since $\varepsilon = -N \frac{d\Phi}{dt}$, a steady DC current produces constant flux ($\frac{d\Phi}{dt} = 0$), resulting in zero induced EMF in the secondary coil.

Transformers are used ______.

Multiple Choice Options

  • A in DC circuits only
  • B in AC circuits only
  • C in both DC and AC circuits
  • D neither in DC nor in AC circuits

Step-by-Step Verified Solution

**Answer:** (b) in AC circuits only. **Step-by-Step Explanation:** Transformers work only with AC because they require changing magnetic flux.

All Questions in this Chapter

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