Describe cross sectional data with their utility.

What is cross-sectional data?

What is the difference between cross sectional data and Time series data?

When a current of 1 A flows through a copper wire of cross sectional area 1mm^2 the drift velocity of free electrons becomes v, What will be the drift velocity of free electrons when the same current flows through a copper wire of cross sectional area 2mm^2 ?

Two conducting wires of lenghts l and 2l have the same cross-sectional area.Compare their resistances.

Two wires are made of the same material and have the same volume. The first wire cross sectional area A and the second wire has cross sectional area 3A. If the length of the first wire is increased by Delta l on applying a force F, how much force is needed to stretch the second wire by the same amount?

The magnitude of the _____per unit cross sectional area on a body is the breaking stress.[Fill in the blanks]

A wire of unifrom cross section is made from 1g of copper whose resistance is 0.2 Omega Determine the length and cross sectional area of the wire. Given the density of copper =9g.cm^-3 and its resistivity =1.8 times 10^-6 Omega .cm.