Verified Solution • 2025–26 Session moderate

QPages 330-331: Q19: HC Verma: Concepts of Physics - Volume 2 Alternating Current Pages 330-331: Q19 Solution: A transformer has 50 turns in the primary and 100 in the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mechanically apply the turns ratio formula $V_s = (N_s/N_p)V_p$ without verifying the input source type. Remember that transformers rely on mutual induction, which requires a changing magnetic flux; a DC supply produces constant flux, resulting in zero induced EMF in the secondary.

A transformer has 50 turns in the primary and 100 in the secondary. If the primary is connected to a 220 V DC supply, what will be the voltage across the secondary?

Step-by-Step Verified Solution

**Answer:** Zero. **Step-by-Step Explanation:** A transformer works on the principle of mutual induction, which requires a changing magnetic flux. DC produces a constant flux, so no EMF is induced in the secondary coil. The output voltage is zero [citation:6].

All Questions in this Chapter

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