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Which of the following devices does NOT utilise the magnetic effects of electric current?
Magnetic compass
Electric generator
Electric motor
Microphone
Magnetic compass
A magnetic compass is a navigational instrument that utilizes the Earth's natural permanent magnetic field to indicate direction. It does not utilize the magnetic effects of electric current (electromagnetism). In contrast, electric generators, electric motors, and microphones all operate on electromagnetic principles involving electric currents and magnetic fields.
A magnetic compass is a navigational instrument that utilizes the Earth's natural permanent magnetic field to indicate direction. It does not utilize the magnetic effects of electric current (electromagnetism). In contrast, electric generators, electric motors, and microphones all operate on electromagnetic principles involving electric currents and magnetic fields.
Using a magnetic compass is like letting a tiny magnetized toy boat naturally align itself with the steady flow of a river, whereas an electric motor is like an artificial turbine driven by pumped water and rotating coils.
COMPASS = Permanent Magnet (No Current Required)
A magnetic compass contains a small, lightweight permanent magnet (the needle) that pivots freely on a pin and aligns itself with the horizontal component of Earth's geomagnetic field. Devices like electric motors and generators rely on Oersted's discovery of electromagnetism and Faraday's laws of electromagnetic induction, where electric currents produce magnetic fields or magnetic fields induce electric currents.
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