A galvanometer with its coil resistance 25Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read up to a current of 2 A the approximate value of the shunt resis

Question

A galvanometer with its coil resistance 25Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read up to a current of 2 A the approximate value of the shunt resistance should be:

TestHub · Accepted Answer

From the above figure, it is clear that, I g ​ R g ​ = ( I − I g ​ ) S S ≃ 2 1 0 − 3 × 25 ​ ⇒ S ≃ 12.5 × 1 0 − 3 ⇒ 1.25 × 1 0 − 2 Ω

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion