The emf of a cell of internal resistance $2 \ \Omega$ is measured using a voltmeter of resistance $998 \ \Omega$. The error in the emf measured is (in $\%$)

What will be the equivalent resistance between the terminals $A$ and $B$ of the infinite resistive network shown in the figure?

Electric bulbs rated $50\, W$ - $100\, V$ glowing at full power are to be used in parallel with a battery of $120\, V$ and internal resistance $10\,\Omega$. The maximum number of bulbs that can be connected so that they glow at full power is:

$A$ uniform wire of resistance $9 \, \Omega$ is cut into $3$ equal parts. They are connected in the form of an equilateral triangle $ABC$. $A$ cell of $e.m.f.$ $2 \, V$ and negligible internal resistance is connected across $B$ and $C$. The potential difference across $AB$ is ............... $V$.

For the network of resistors shown in the figure,choose the correct option.

Two resistances of $400 \Omega$ and $800 \Omega$ are connected in series with a $6 \text{ V}$ battery of negligible internal resistance. $A$ voltmeter of resistance $10000 \Omega$ is used to measure the potential difference across the $400 \Omega$ resistor. The error in the measurement of potential difference in volts is approximately: