Three moving coil galvanometer A,B and C are made of coils of three different material having torsional constrant `1.8xx10^(-8), 2.8xx10^(-8)` and `3.8xx10^(-8)` respectively if the three galvanometer are identical in all other respect then in which of the above cases sensitivity maximumA. AB. CC. BD. same in each case

Three moving coil galvanometer A,B and C are made of coils of three di

1.	Three moving coil galvanometer A,B and C are made of coils of three different material having torsional constrant `1.8xx10^(-8), 2.8xx10^(-8)` and `3.8xx10^(-8)` respectively if the three galvanometer are identical in all other respect then in which of the above cases sensitivity maximumA. AB. CC. BD. same in each case
Answer» Correct Answer - A If `theta` is the deflection in the galvanometer when current l is passed through it thenn current sensitivity `l_(s)=(theta)/(l)=(nBA)/(k)` where k be restoring torque per unit twist n be number of turns in the coil B is strenght of magnetic field in which coil is suspended A be area of coil sinc restoring torque per unit twist (trosional constant ) is minimum for galvanometer A hence it will be more sensitvie

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