Pick out the expression for galvanometer constant from the following?(a) G = \(\frac {k}{NAB}\)(b) G = k × NAB(c) G = \(\frac {NAB}{k}\)(d) \(\frac {1}{G} \, = \, \frac {k}{NAB}\)I have been asked this question during an interview.Origin of the question is Moving Coil Galvanometer topic in portion Moving Charges and Magnetism of Physics – Class 12

Pick out the expression for galvanometer constant from the following?(

1.	Pick out the expression for galvanometer constant from the following?(a) G = \(\frac {k}{NAB}\)(b) G = k × NAB(c) G = \(\frac {NAB}{k}\)(d) \(\frac {1}{G} \, = \, \frac {k}{NAB}\)I have been asked this question during an interview.Origin of the question is Moving Coil Galvanometer topic in portion Moving Charges and Magnetism of Physics – Class 12
Answer» RIGHT OPTION is (a) G = \(\frac {k}{NAB}\) For explanation: In a moving coil GALVANOMETER, the current (I) passing through the galvanometer is directly proportional to its deflection (θ), i.e. I = Gθ Where G = \(\frac {k}{NAB}\) ➔ Galvanometer constant N = number of turns in the coil; A = area of coil; B = strength of the magnetic field; k = torsional constant of the spring that means restoring torque per UNIT twist.

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