$3$ identical bulbs are connected in series and these together dissipate a power $P$. If now the bulbs are connected in parallel,then the power dissipated will be

$A$ wire has a resistance of $24\,\Omega$ and is bent into the shape shown in the figure. The effective resistance between $A$ and $B$ is .............. $\Omega$.

Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is

The equivalent resistance across points $A$ and $B$ in the circuit shown below is:

The lowest resistance which can be obtained by connecting $10$ resistors each of $1/10$ $\Omega$ is

$A$ uniform ring of conducting wire of radius $r$ has resistance $R$. $A$ and $B$ are two points on the ring which subtend an angle $\theta$ at the centre of the ring. The equivalent resistance between points $A$ and $B$ is: