Question

The resistance of a galvanometer is 100 $\Omega$ . A shunt of 5 $\Omega$ is connected to it to convert it into an ammeter. The internal resistance of the ammeter is

• A. 5.2$\Omega$
• B. 4.8$\Omega$
• C. 4.6$\Omega$
• D. 4.2$\Omega$

Answer 1

The correct option is B 4.8$\Omega$

$Req=\frac{100\times 5}{100+5}=\frac{500}{105}=4.8\Omega$ (since both the resistances are in parallel)