In the arrangement of resistances shown below,the effective resistance between points $A$ and $B$ is ............... $\Omega$.

Four wires of equal length and of resistances $10 \ \Omega$ each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is ............. $\Omega$. (in $Omega$)

The current $I_{1}$ (in $A$) flowing through the $1\; \Omega$ resistor in the following circuit is:

If three resistors of resistance $2 \,\Omega$,$4 \,\Omega$ and $5 \,\Omega$ are connected in parallel,then the total resistance of the combination will be:

The equivalent resistance between $A$ and $B$ as shown in the figure is $........\,k\Omega$.

The resistance of the series combination of two resistances is $S$. When they are joined in parallel,the total resistance is $P$. If $S = nP$,then the minimum possible value of $n$ is