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Extention is directly proportional to length and inversly proportional to area......http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_1.pdf
Q no 22 plz///am getting 1/4 :?
so for same extention for both wires P and Q, tention in P will be F for length l and tention in Q will be F/2 for length 2l, tention in P will be F for area A and tention in Q will be F/2 for area A/2.............
so the total ratio due to length l and 2l and area A and A/2 will be........
(tention in P)/(tention in Q)=4/1 ( D )