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

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

Ammeter

Voltmeter

Magnetic needle

Motor

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Answer is Wrong!

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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