1
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
- length = 200 cm, diameter = 2 mm
- length = 300 cm, diameter = 3 mm
- length = 50 cm, diameter = 0.5 mm
- length = 100 cm, diameter = 1 mm
Answer
(3) length = 50 cm, diameter = 0.5 mm
Solution
L = FLAY = 4FL d2 Y
Same material and same tension L Ld2
(1) 20022 = 50
(2) 30032 = 33.3
(3) 50(0.5)2 = 200
(4) 10012 = 100
wire (3) has the largest extension.
Answer: (3)
NEET 2013