PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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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. - PUC Karnataka Science Class 12 - Physics

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Question

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)

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Solution 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. Concept: Moving Coil Galvanometer.
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