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Sensitivity of a moving coil galvanometer can be increased by Fill in the blank.

1. decreasing number of turns in rectangular coil
2. decreasing magnetic induction of magnetic field
3. increasing area of rectangular coil
4. increasing twist constant of phosphor bronze fiber

Correct answer: increasing area of rectangular coil

Solution

The deflection of a moving-coil galvanometer is proportional to the magnetic torque, which depends on the coil area. Increasing the area increases torque for the same current, so the instrument becomes more sensitive.

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