Question

A rectangular coil of a moving coil galvanometer contains 50 turns each having area 12 cm2 . It is suspended in radial magnetic field 0.025 Wb/m² by a fibre of twist constant 15 x10^-10 Nm/degree. Calculate the sensitivity of the moving coil galvanometer.

Answer 1

Given:-

N = 50, A = 12 cm² = 12 x 10^-4 m²,

B = 0.025 Wb/m²,

C = 15 x 10^-10 Nm/degree

To find:- Sensitivity (S_i)

Formula: S_i = NAB/C

Calculation: From formula,

`S_i=(50xx12xx10^-4xx0.025)/(15xx10^-10`

`thereforeS_i=10^6"div/A"`

The sensitivity of a moving coil galvanometer is 10⁶ div/A.