(D) The resistance of an ammeter is given by $R_A = \frac{G \cdot S}{G + S}$,where $G$ is the galvanometer resistance and $S$ is the shunt resistance.

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Statement-$I$ is false,Statement-$II$ is true.

(D) The resistance of an ammeter is given by $R_A = \frac{G \cdot S}{G + S}$,where $G$ is the galvanometer resistance and $S$ is the shunt resistance.To increase the range $(I)$ of an ammeter,the shunt resistance $S$ must be decreased,as $S = \frac{I_g G}{I - I_g}$.As the range $I$ increases,the required shunt resistance $S$ decreases,which in turn decreases the total resistance of the ammeter $R_A$. Therefore,Statement-$I$ is false.Statement-$II$ is true because connecting an additional shunt in parallel effectively reduces the total resistance and allows a larger current to bypass the galvanometer,thereby increasing the range.

Class 12 Physics Moving Charges and Magnetism The Moving Coil Galvanometer (Sensitivity) and Ammeter and Voltmeter Conversion

Easy

This question has Statement-$I$ and Statement-$II$. Of the four choices given after the statements,choose the one that best describes the two statements.
Statement-$I$: Higher the range,greater is the resistance of an ammeter.
Statement-$II$: To increase the range of an ammeter,an additional shunt needs to be used across it.

JEE MAIN 2013 All JEE MAIN

A
Statement-$I$ is true,Statement-$II$ is true,Statement-$II$ is the correct explanation of Statement-$I$.
B
Statement-$I$ is true,Statement-$II$ is true,Statement-$II$ is not the correct explanation of Statement-$I$.
C
Statement-$I$ is true,Statement-$II$ is false.
D
Statement-$I$ is false,Statement-$II$ is true.

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Moving Charges and Magnetism

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The Moving Coil Galvanometer (Sensitivity) and Ammeter and Voltmeter Conversion

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An ammeter with a resistance of $2 \,\Omega$ can measure up to $100 \,mA$. What resistance (in $\Omega$) must be connected in series to make it measure up to $5 \,V$?

In a galvanometer,$5 \%$ of the total current in the circuit passes through it. If the resistance of the galvanometer is $G$,the shunt resistance $S$ connected to the galvanometer is

Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.

An ammeter gives full-scale deflection when a current of $2 \, A$ flows through it. The resistance of the ammeter is $12 \, \Omega$. If the same ammeter is to be used for measuring a maximum current of $5 \, A$,then the ammeter must be connected with a resistance of:

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Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.
$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.
$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.