In the circuit shown,$R_1$ is increased. What happens to the reading of the voltmeter (ideal)?

When a current of $4 \, A$ is passed through a cell for $2 \, minutes$,the mass deposited at the cathode is $m \, g$. If a current of $6 \, A$ is passed through the same cell for $40 \, seconds$,what mass will be deposited at the cathode?

In the circuit shown,the readings of the ammeter and voltmeter are $4\,\, A$ and $20\,\, V$ respectively. The meters are non-ideal. Then $R$ is

When two ends of a conductor are at different temperatures,the electromotive force generated between the two ends is known as:

$A$ resistance network is connected to a battery as shown in the figure below. If the internal resistance of the battery is $5 \ \Omega$,then the value of $R$ (in $\Omega$) for maximum power delivered to the network is

In the given figure-$1$,the resistance of the shown voltmeter is variable. The variation of its reading with respect to its resistance is shown in figure-$2$. The value of $R$ is ............... $\Omega$.