Correct option is A
Correct Answer:A. Magnetic Compass
Explanation:
· The magnetic compass does not utilize the magnetic effects of electric current. Instead, it functions based on the Earth's magnetic field to align its needle towards the magnetic north.
· Unlike devices such as electric motors or generators, it does not rely on electricity or the magnetic field generated by electric currents for its operation.
Analysis of Options:
- Magnetic Compass: Operates solely on the Earth's natural magnetic field, not on the magnetic effects of electric current.
- Electric Generator: Uses electromagnetic induction, which directly involves the magnetic effects of electric current.
- Electric Motor: Relies on the interaction between a magnetic field and current to produce rotational motion.
- Microphone: Some types of microphones (like dynamic microphones) use electromagnetic induction, which is related to the magnetic effects of electric current.