Which device is used to measure the current flow using needle deflection caused by a magnetic field force acting upon a current-carrying wire?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Galvanometer.
A galvanometer is a device used to detect and measure small electric currents. It works on the principle that a magnetic field exerts a force on a current-carrying conductor, causing a needle to deflect. The deflection of the needle is proportional to the amount of current flowing through the wire. This makes it ideal for sensitive current measurements in circuits.
Other Option:
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Psophometer – Measures noise levels (especially in telephone circuits), not current.
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Potentiometer – Measures voltage or electrical potential; not designed for measuring current.
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Ammeter – Measures larger current flow, but typically not as sensitive as a galvanometer.