Question

Which of the following is mismatched pair?

• A. Eddy current - Induction furnace
• B. Transformer - Laminated core
• C. Induced emf - Biot-Savart law
• D. Coaxial coil - Mutual induction

Hint:

Always verify the actual purpose and role of each element in a system before determining the correctness of pairings in a physical setup.

Answer 1

The Correct Option is A

The correct pairings are as follows: - Eddy current - Induction furnace: This is incorrect. Eddy currents are unwanted currents that circulate within a conducting material due to a changing magnetic field. While induction furnaces use induction heating (which generates heat due to eddy currents), the actual use of eddy currents is not the purpose of induction furnaces. The heating occurs due to induced currents, but they are not the same as "eddy currents," which are usually considered undesirable in most applications. 
- Transformer - Laminated core: This is correct. In transformers, the core is laminated to reduce eddy currents and the associated energy losses. This is an important design feature in transformers. 
- Induced emf - Biot-Savart law: This is correct. The Biot-Savart law is used to calculate the magnetic field generated by a current-carrying conductor, and the induced emf is related to the change in magnetic flux. This relationship is described by Faraday’s law of induction. 
- Coaxial coil - Mutual induction: This is correct. A coaxial coil can be used to demonstrate mutual induction, where the magnetic field generated by a current in one coil induces a current in a nearby coil. 
Thus, the incorrect match is (A) Eddy current - Induction furnace.