You are given $10$ resistors each of resistance $2 \mathrm{\Omega }$. First they are connected to obtain minimum possible resistance. Then they are connected to obtain maximum possible resistance. The ratio of maximum and minimum resistance is ______.

In the circuit shown, the value of each resistance is $r$. Then equivalent resistance of circuit between points $A$ and $B$ will be

A wire has resistance of $24 \mathrm{\Omega }$ is bent in the following shape. The effective resistance between $A$ and $B$ is

A $3 \mathrm{V}$ battery with negligible internal resistance is connected in a circuit, as shown in the figure. The current $i$ will be

The reading of voltmeter is

Five identical resistors each of resistance $1 \mathrm{\Omega }$ are initially arranged as shown in the figure by clear lines. If two similar resistances are added as shown by the dashed lines then change in resistance in final and initial arrangement is