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The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
Options
(a) length = 100 cm, diameter = 1 mm
(b) length = 200 cm, diameter = 2 mm
(c) length = 300 cm, diameter = 3 mm
(d) length = 50 cm, diameter = 0.5 mm
Correct Answer:
length = 50 cm, diameter = 0.5 mm
Explanation:
F = YA / L x l
So, extension l ∞ L / A ∞ L / D² [F and Y are constant]
l₁ ∞ 100 / 1² ∞ 100 l₂ ∞ 200 / 2² ∞ 50
l₃ ∞ 300 / 3² ∞ 100 / 3 l₄ ∞ 50 / 1 / 4 ∞ 200
The ratio of L / D² is maximum for case (d).
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Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two equal and opposite charges of masses m₁ and m₂ are accelerated
- A force of 5 N is acting on an object. Displacement of object is 10 m and the work done
- A bus is moving with a velocity of 5 ms⁻¹ towards a huge wall.
- Two wires of the same dimensions but resistivities p1 and p2 are connected in series
- If voltage across a bulb rated 220 volt-100 Watt drops by 2.5% of its rated value
Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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