Resistivity of two elements $A$ and $B$ are $1.62 \times 10^{-8} \, \Omega m$ and $520 \times 10^{-8} \, \Omega m$ respectively. Out of these two,name the element that can be used to make
$(i)$ filament of electric bulb.
$(ii)$ wires for electrical transmission lines. Justify your answer in each case.

(A-B, B-A) $(i)$ Element $B$: It is used for the filament of an electric bulb because it has a high resistivity $\left(520 \times 10^{-8} \, \Omega m\right)$. High resistivity allows the filament to produce a large amount of heat when current passes through it,enabling it to glow.
$(ii)$ Element $A$: It is used for electrical transmission lines because it has a very low resistivity $\left(1.62 \times 10^{-8} \, \Omega m\right)$. Low resistivity ensures minimal energy loss in the form of heat during the transmission of electric power over long distances.