A galvanometer with its coil resistance 25 Ω 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:

Question

A galvanometer with its coil resistance 25 Ω 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:, 1.25 × 10 - 2 Ω, 2.5 × 10 - 3 Ω, 2.5 × 10 - 2 Ω, 1.25 × 10 - 3 Ω

MARKS App · Accepted Answer

From the above figure, it is clear that, I g R g = ( I - I g ) S S ≃ 10 - 3 × 25 2 ⇒ S ≃ 12.5 × 10 - 3 ⇒ 1 .25 × 10 - 2 Ω

Search any question & find its solution

Looking for more such questions to practice?