Correct Answer:
C. Both A & B
Correct answer: Both A & B. Traditional fans use electromagnets (induction motors), while modern BLDC fans use electromagnetic coils together with permanent magnets.
Background: BLDC stands for brushless direct current motor.
- Electromagnet only: Electromagnets alone are not used in all ceiling fans.
- Permanent magnet only: Permanent magnets alone are not used in traditional fans.
- None of these: “None of these” is incorrect because both A and B is correct.
Did you know? BLDC fans use much less electricity.
Memory trick: Old fan = electromagnet; new fan = both.