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# Problem: A certain ammeter has a resistance of 5.5 × 10-5 Ω on a scale which reads up to 2.9 A, and contains a 7.5-Ω galvanometer.What is the sensitivity of the galvanometer, in microamperes?

###### FREE Expert Solution

Current sensitivity of a galvanometer:

$\overline{){{\mathbf{i}}}_{{\mathbf{G}}}{\mathbf{=}}\frac{\mathbf{i}\mathbf{R}}{\mathbf{r}}}$

Substituting:

###### Problem Details

A certain ammeter has a resistance of 5.5 × 10-5 Ω on a scale which reads up to 2.9 A, and contains a 7.5-Ω galvanometer.

What is the sensitivity of the galvanometer, in microamperes?