Question

Which of the following works on the principle of electromagnetic induction?

• A. Electric fan.
• B. Transformer.
• C. Electric heater.
• D. All of the above.

Hint:

Electromagnetic induction is used in many electrical devices such as motors, transformers, and generators. It is the fundamental principle behind devices that involve the generation or transfer of electrical energy.

Answer 1

The Correct Option is D

Step 1: Electromagnetic induction principle.
Electromagnetic induction is the process where a changing magnetic field induces an electric current in a conductor. This principle is used in various electrical devices. Step 2: Working of different devices.
Electric fan: The motor in the fan operates on the principle of electromagnetic induction, where the changing magnetic field in the motor induces a current in the coils to create motion.
Transformer: A transformer uses electromagnetic induction to transfer electrical energy between two circuits via a changing magnetic field. Incandescent light bulb: The filament in the bulb heats up due to the flow of current, which is created by electromagnetic induction from the power supply.
Electric heater: The heating element in the electric heater works through electromagnetic induction to convert electrical energy into heat.
Step 3: Conclusion.
All of these devices use electromagnetic induction, which is why the correct answer is "All of the above."