Ammeter and Voltmeter — Prelims Questions

A galvanometer has a resistance of $50,Omega$ and gives full-scale deflection for a current of $10,\text{mA}$. To convert it into an ammeter of range $5,\text{A}$, the shunt resistance required is:

A galvanometer has a resistance of $100,Omega$ and shows full-scale deflection for a current of $1,\text{mA}$. To convert it into a voltmeter of range $10,\text{V}$, the series resistance required is:

Which of the following statements is INCORRECT regarding an ideal ammeter and an ideal voltmeter?

A galvanometer of resistance $G$ is shunted by a resistance $S$. The total current in the circuit is $I$. The current through the galvanometer is $I_g$. What is the ratio $I_g/I$?

A voltmeter of resistance $R_V$ is used to measure the potential difference across a resistor $R$ in a circuit. What is the effective resistance of the parallel combination of $R$ and $R_V$?

A galvanometer can be converted into an ammeter by connecting a low resistance in parallel. How does the effective resistance of the converted ammeter compare to the original galvanometer resistance?