State the principle of moving coil galvanometer. Explain its working and obtain the expression for the deflection produced due to current passed through the coil. Define the current sensitivity.

 

 
 
 
 
 

Answers (1)
S safeer

When a current carrying coil is placed in a magnetic field, its experiences a torque which causes a coil to rotate at a certain angle.

 When the current is passed through the coil, it experiences a torque which expressed as;

\tau = NIAB \sin \theta

 where,

N = number of turns

A = area

B = magnetic field

I = current

\tau = NIAB \sin \theta            (\because \sin \theta = 90^{\circ})

then,

\tau = NIAB

then, 

Restoring torque \tau ^{'}= k\phi

at equilibrium,

\tau = \tau ^{'}

\therefore NIAB = k\phi

\phi = \left [ \frac{NAB}{k} \right ]I

 \frac{\phi}{I}= \frac{NAB}{k}  is the current sensitivity.

Current sensitivity is defined as the deflection per unit current.

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