Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

State the Underlying Principle of Working of a Moving Coil Galvanometer. Write Two Reasons Why a Galvanometer Can Not Be Used as Such to Measure Current in a Given Circuit. - Physics

State the underlying principle of working of a moving coil galvanometer. Write two reasons why a galvanometer can not be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvanometer depends.

Solution

The underlying principle for the working of a moving coil galvanometer is that when a current-carrying conductor is placed inside a magnetic field, it experiences a magnetic force.

The two reasons why a galvanometer cannot be used for measuring current are

• The high resistance of galvanometer can disturb the original current flowing through the circuit

• The high current present in the circuit can destroy the coil windings present in the galvanometer

The factors on which the current sensitivity of a galvanometer depends are

• Number of turns in the coil

• Torsional spring constant

• Area of the coil

• Strength of the magnetic field

(Any two can be taken as the answer)

Concept: Moving Coil Galvanometer
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