Which of the following devices does NOT utilise the magnetic efffects of electric current?
Magnetic compass
The correct answer is Option 1 i.e. Magnetic compass.
The device that does not utilize the magnetic effects of electric current is the magnetic compass.
Other options:
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Microphone – Uses a diaphragm attached to a coil in a magnetic field. When sound waves vibrate the diaphragm, the coil moves, inducing an electric current (electromagnetic induction).
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Electric Motor – Works on the principle of the magnetic effect of current, where a current-carrying coil in a magnetic field experiences a force, causing rotation.
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Electric Generator – Operates via electromagnetic induction, where mechanical energy rotates a coil in a magnetic field, generating electricity.
The magnetic compass, however, relies on Earth's natural magnetic field to align its needle (a permanent magnet) and does not require an electric current to function. Thus, it does not use the magnetic effects of current.
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