A wire is roplaced by another wire of same length and material but of twice diameter.
(i) What will be the effect on the increases in its length under a given load?
(ii) What will be the effect on the maximum load which it can bear?

Explanation

(i) increases in length will be reduced to one fourth as `Delta l prop 1//r^(2)`
(ii) Maximum bearable load becomes four times as breaking force `prop area (=pi r^(2))`.