In a moving coil galvanometer the coil is suspended between the pole pieces of a strong horse-shoe magnet. The pole pieces are made cylinderical and a soft iron cylinderical core is placed within the coil without touching it. This makes the field radial. In such a field the plane of the coil always remains parallel to the field. Therefore and the deflecting torque always has the maximum value.
![1729_Moving coil galvanometer.png](https://www.expertsmind.com/../CMSImages/1729_Moving coil galvanometer.png)
......(i)
coil deflects, a restoring torque is set up in the suspension fibre. If a is the angle of twist, the restoring torque is
.....(ii)
where C is the torsional relation of the fiber.
When the coil in equilibrium.
NBiA = ![79_Moving coil galvanometer3.png](https://www.expertsmind.com/../CMSImages/79_Moving coil galvanometer3.png)
Where
is the galvanometer constant. This linear relationship between i and a makes the moving coil galvanometer useful for current measurement and detection.
Current sensitivity : The current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer per unit current flowing through it.
![667_Moving coil galvanometer5.png](https://www.expertsmind.com/../CMSImages/667_Moving coil galvanometer5.png)
Thus in orders to increase the sensitivity of a moving coil galvanometer, N, B and A should be increased and C should be decreased.
Quartz fibers may also be need for suspension of the coil because they have large tensile strength and very low value of k.
Voltage sensitivity (SV) : Voltage sensitivity of a galvanometer is defined as the deflection produced in the galvanometer per unit applied to it.
![713_Moving coil galvanometer6.png](https://www.expertsmind.com/CMSImages/713_Moving%20coil%20galvanometer6.png)
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