What is the maximum resistance which can be made using five resistors each of $1/5 \ \Omega$ (in $Omega$)?

$(a)$ Explain how a cell maintains current in a circuit.
$(b)$ In the circuit given below,the resistance of the path $xTy = 2 \, \Omega$ and that of $xZy = 6 \, \Omega$.
$(i)$ Find the equivalent resistance between $x$ and $y$.
$(ii)$ Find the current in the main circuit.
$(iii)$ Calculate the current that flows through the path $xTy$ and $xZy$.

The $SI$ unit of resistivity of the material is $......$

$A$ cylindrical conductor of length $l$ and uniform area of cross-section $A$ has resistance $R$. Another conductor of length $2l$ and resistance $R$ of the same material has area of cross-section:

If the cross-sectional area of a conducting wire is doubled,what will be the effect on its resistance?

What is meant by resistance?