Question

a dry cell usually has a small cap at one end and a flat surface at the other end. which of the two is ate have potential and why

Answer 1

the end where chemical reaction occur and create p d. has more potential energy more.
Hope it helps!

Answer 2

The side with a cap is of higher potential .

As the current flows from positive terminal of the cell to the negative terminal, therefore the current flows from positive end to negative end