derive the expression for current sensitivity
Answer (1)
30th Jan, 2020
Hello,
If dθ is change in the deflection produced used by a small change in the current dI, sensitivity (S) of galvanometer is given by
S = dθ /dI
The current ( I ) flowing through the moving coil galvanometer is given by
I = k/NAB × θ
where θ is the angle of deflection, N is it turns, is A is area, B is magnetic induction and k is the couple per unit twists.
Sp, θ = NAB / k × I
So, dθ /dI = NAB / k
Hence, S = NAB / k
Best Wishes
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