In the given circuit,the current in each resistance is: (in $A$)

Five equal resistors, each of resistance $R$, are connected as shown in the figure below. $A$ battery of $V$ volt is connected between $A$ and $B$. The current flowing in $FC$ will be

The potential difference across the $40\,\Omega$ resistor in the given circuit is ............ $V$.

$A$ voltmeter of resistance $150 \Omega$ connected across a cell of e.m.f. $3 \ V$ reads $2.5 \ V$. What is the internal resistance of the cell (in $\Omega$)?

The wiring of a house has a resistance of $6\,\Omega$. $A$ $100\,W$ bulb is glowing. If a geyser of $1000\,W$ is switched on,the change in potential drop across the bulb is nearly .................. $V$.

$A$ cell of internal resistance $r$ is connected across an external resistance $n r$. Then the ratio of the terminal voltage to the emf of the cell is