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(B) The current sensitivity of a moving coil galvanometer is given by the formula: $S_i = \frac{	heta}{I} = \frac{NBA}{k}$.Here,$N$ is the number of

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$1^{st}$ and $3^{rd}$ ways only

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(B) The current sensitivity of a moving coil galvanometer is given by the formula: $S_i = \frac{	heta}{I} = \frac{NBA}{k}$.Here,$N$ is the number of turns,$B$ is the magnetic field,$A$ is the area of the coil,and $k$ is the torsion constant of the spring.To increase the sensitivity $(S_i)$:$1$. Increase $N$ (number of turns).$2$. Increase $B$ (using a stronger magnet).$3$. Increase $A$ (using a larger coil).$4$. Decrease $k$ (using a spring with a smaller torsion constant).Comparing these with the given options,the $1^{st}$ way (smaller torsion constant) and the $3^{rd}$ way (stronger magnet) will increase the sensitivity. Therefore,the correct option is $B$.

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Which one of the following modifications may increase the sensitivity of a moving coil galvanometer?$1^{st}$ Way: By using a spring of smaller torsion constant.$2^{nd}$ Way: By using a smaller coil.$3^{rd}$ Way: By using a stronger magnet.$4^{th}$ Way: By using a coil having fewer number of turns.