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Question 13

Given below are two statements:
Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.
Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio
In the light of the above statements, choose the correct answer from the options given below:

Statement I: If the number of turns N is doubled, current sensitivity = $$\frac{NBA}{k}$$. Doubling N doubles current sensitivity. This is true.

Statement II: Voltage sensitivity = Current sensitivity / Resistance = $$\frac{NBA}{kR}$$. When N doubles, resistance R also doubles (since $$R \propto N$$). So voltage sensitivity = $$\frac{2NBA}{k \cdot 2R} = \frac{NBA}{kR}$$, which remains the same. This is false.

The correct answer is Option 1: Statement I is true but Statement II is false.

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