Question

How can the current sensitivity increase?​

Answer 1

Current sensitivity can be increased by increasing the number of turns of the coil. ... Since voltage sensitivity decreases with increase in resistance of the coil, the effect of increase in number of turns is nullified in the case of voltage sensitivity.

Answer 2

The current sensitivity can be increased in the following way:

• Current sensitivity is a characteristic of the Galvanometer, a current measurement device.
• When a unit current goes through it, it deflects.
• However, the current sensitivity of galvanometers is determined by three factors:

1. The coil's number of turns (N)
2. Coil's magnetic field (B)
3. Coil's surface area (A)
4. Torque restoration (K)

• It can be expressed in the following way:
• Current sensitivity of galvanometer = $\frac{NBA}{K}$
• We may deduce from the above expression that current sensitivity varies proportionally with the number of turns in the coil, the magnetic field, and the coil area.
• As a result, we may raise any of these parameters or lower the restoring torque to increase current sensitivity.
• However, increasing the number of turns in the coil to enhance current sensitivity is a feasible alternative in this circumstance.