Which of the following devices does NOT utilise the magnetic effects of electric current?

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.