If the rheostat slider were to move from the extreme right to the far left,how will the reading of voltmeter $V_1$ change?

When a resistance of $2\,\Omega$ is connected across the terminals of a cell,the current is $0.5\,A$. When the resistance is increased to $5\,\Omega$,the current is $0.25\,A$. The $e.m.f.$ of the cell is ................. $V$.

In the circuit shown in the figure below,which of the following statements is incorrect?

In the given figure, an ammeter reads $5 \, A$ and a voltmeter reads $40 \, V$. The actual value of resistance $R$ is

To determine the resistance $(R)$ of a wire,a circuit is designed as shown below. The $V-I$ characteristic curve for this circuit is plotted for the voltmeter and the ammeter readings as shown in the figure. The value of $R$ is . . . . . . . $\Omega$.

In the given circuit,the current flowing through the circuit is: (in $A$)