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  4. Best method to increase the sensitivity of the moving coil galvanometer is to increase :

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Q. Best method to increase the sensitivity of the moving coil galvanometer is to increase :

Solution:

$\sigma = n \frac{AB}{c}$. Increase in n increases the resistance of the coil. Increase in A also increases length of each turn and hence resistance of the coil increases. Thus there is a limit upto which n or A can be increased. Also, the value of torsional torque per unit twist (c) depends on the nature of material of the suspension wire. Thus, the best way to increase $\sigma$ is to increase B.