Question

A Galvanometer of resistance 82 is shunted with a resistance S. If full scale deflection current is 3mA and the maximum current pass through the Ammeter is 8A. Find the value of shunt.

(1) 3mΩ

(2) 5mΩ

(3) 7mΩ

(4) 9mΩ

Answer 1

Correct option is (1) 3mΩ

\((3mA) \times 8 \Omega = S \times (8 - 3 \times 10^{-3})A\)

⇒ \(\frac{24}{1000} = S(8)\)

\(S = 3m\Omega\)