The presence of magnetic field can be determined using which one of th

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The presence of magnetic field can be determined using which one of the following instruments?

Ammeter
Voltmeter
Magnetic needle
Motor
This question was previously asked in
UPSC NDA-2 – 2022
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The presence of a magnetic field can be determined using a magnetic needle.
A magnetic needle, like the one in a compass, is a small magnet pivoted to rotate freely. When placed in a magnetic field, it aligns itself with the direction of the field lines, indicating the presence and direction of the field.
An Ammeter measures electric current. A Voltmeter measures electric potential difference (voltage). A Motor converts electrical energy into mechanical energy using the principle of magnetic force on a current-carrying wire, but it’s not primarily an instrument for *detecting* a magnetic field’s presence in general. Other instruments for measuring magnetic fields include magnetometers, but a magnetic needle is a simple and fundamental tool for detection.

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