Question

what is Galvanometer constant?​

Answer 1

Galvanometer Constant

Assume a galvanometer with a very short needle and so placed with respect to its coils that the magnetic field produced by a current circulating in them is sensibly uniform in the neighborhood of the needle, with its lines of force at right angles thereto. The field is proportional to the current i, so that it may be denoted by G i. Then G is the galvanometer constant. If now the angle of deflection of the needle is ? against the earth's field H, M being the magnetic moment of the needle we have G i M cos ? = H M sin ? or i = (H/G)* tan ?. H/G is the reduction factor; variable as H varies for different places. For a tangent galvanometer the constant G is equal to 2*PI*(n/a), in which n denotes the number of turns of wire, and a denotes the radius of the circle.

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Answer 2

The galvanometer constant of a coil is the strength of the magnetic field produced by a unit current flowing in it at its center. As a result, if a current flows in a coil with a galvanometer constant of G, the field strength at the coil's center is Gi, and the lines of force are at right angles to the coil.

Explanation:

• A galvanometer is an electric current measurement instrument that is electromechanical. Early galvanometers were uncalibrated, but later versions, known as ammeters, were calibrated and could more precisely detect current flow.
• The G stands for the galvanometer's displacement constant, and its value is $NBA = NBld$. At deflection F, the suspension's regulating torque is For final steady deflection.
• Galvanometers were initially uncalibrated, but later versions, known as ammeters, were calibrated and could more precisely measure current flow.
• The electric current passing through a coil under a steady magnetic field causes a galvanometer to deflect a pointer. Galvanometers are similar to actuators in that they can be used to control the flow of current.