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QPage 338: Q2: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Waves Page 338: Q2 Solution: A metal rod is placed along the axis of a solenoid carrying a…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the induced electromotive force (EMF) with the actual current flow; while a changing magnetic field induces an EMF, the heating is specifically caused by the resistance opposing the induced eddy currents, not the EMF itself.

A metal rod is placed along the axis of a solenoid carrying a high-frequency alternating current. It is found that the rod gets heated. Explain why the rod gets heated.

Step-by-Step Verified Solution

**Answer:** The rod gets heated due to eddy currents induced by the high-frequency alternating magnetic field. **Step-by-Step Explanation:** A solenoid carrying high-frequency alternating current produces a rapidly changing magnetic field. This changing field induces eddy currents in the metal rod placed along the axis. These eddy currents dissipate energy as heat due to the resistance of the metal, causing the rod to heat up. This is the principle of induction heating [citation:1].

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