In a moving coil galvanometer, two moving coils 
and 
have the following particulars:
Assuming that torsional constant of the springs are same for both coils, what will be the ratio of voltage sensitivity of 
and 
?
Text Solution
Verified by ExpertsA
In a moving coil galvanometer, the voltage sensitivity is given by the formula:
Voltage sensitivity 
Here, 
is the deflection angle, 
is the voltage, 
is the number of turns, 
is the coil area, 
is the magnetic field, 
is the torsional constant of the spring, and 
is the resistance of the coil.
For the two moving coils 
and 
, we want to determine the ratio of their voltage sensitivities. Given that the torsional constant 
is the same for both coils, we can express the ratio as:
We calculate:
Thus, the ratio of the voltage sensitivities of 
to 
is 
.
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