Two uniform wires $A$ and $B$ are of same metal and have equal masses. The radius of wire $A$ is twice that of wire $B$. The total resistance of $A$ and $B$, when connected in parallel is:

Equivalent resistance between points $A$ and $B$ is

In the circuit shown, the current in $3 \mathrm{\Omega }$ resistance is

In the circuit shown in the figure potential difference between points $A$ and $B$ is $16 \mathrm{V}$ the current passing through $2 \mathrm{\Omega }$ resistance will be