How does (a) resistance, and (b) specific resistance of a wire depend on it's (i) length, and (ii) radius?

Define the term specific resistance and state it's S.I. unit.

(a) Name two factors on which the specific resistance of a wire depends?

(b) Two wires A and B are made of copper. The wire A is long and thin while the wire B is short and thick. Which will have more specific resistance?

(a) Name the material used for making connection wires. Give reason for your answer.

(b) Why should a connection wire be thick?