In the given circuit, the equivalent resistance between the terminal A and B is __________ $$\Omega$$.

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.

A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The resistance of the conductor is $$n\times10^{-3}\Omega$$. If the resistivity of the material is $$\mathrm{2.4\times10^{-8}\Omega m}$$. The value of $$n$$ is ___________.

The current I flowing through the given circuit will be __________A.