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# A Rectangular Coil of a Moving Coil Galvanometer Contains 100 Turns, Each Having Area 15 cm^2. It is Suspended in the Radial Magnetic Field 0.03 T. - Physics

#### Question

A rectangular coil of a moving coil galvanometer contains 100 turns, each having area
15 cm2. It is suspended in the radial magnetic field 0.03 T. The twist constant of suspension
fibre is 15 x 10-10 N-m/degree. Calculate the sensitivity of the moving coil galvanometer.

#### Solution

Given: N = 100, A = 15 cm^2 = 15 xx 10^-4 m^2,

B = 0.03 (Wb)/m^2,

C = 15 xx 10^-10 "Nm"/"degree"

To find: Sensitivity (Si)

Formulae: S_i=(NAB)/c

S_i=(100xx15xx10^-4xx0.03)/(15xx10^-10)

S_i=3xx10^6 "div"/A

The sensitivity of a moving coil galvanometer is 3 xx 10^6 "div"/A.

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