NEET Class neet Answered
A tungsten wire, 0.5 mm in diameter, is just stretched between two fixed points at a temperature of 40°C. Determine the tension in the wire when the temperature falls to 20°C. (coefficient of linear expansion of tungsten = 4.5 × 10–6/°C ; Young's modulus of tungsten = 3.45 × 1010 Nm–2)
Asked by jyothiboda22 | 26 Aug, 2019, 09:35: PM
Expert Answer
Youngs modulus Y = Stress / Strain = ( T / A ) / ( Δl / l ) ........................... (1)
where T is tension in wire, A is area of cross section, Δl is change in length due to fall in temperature
and l is its original length .
Hence Tension T = Y × ( Δl / l ) × A ......................... (2)
change in length of wire = Δl = l × α × ΔT
Hence eqn.(2) is rewritten as, T = Y × α × ΔT × A
T = 3.45 × 1010 × 4.5 × 10-6 ×20 × (π×0.5×0.5×10-6)/4 ≈ 0.61 N
Answered by Thiyagarajan K | 26 Aug, 2019, 10:15: PM
Application Videos
-
Growth of Current in L-R Circuit
In this video, the growth of current in RL circuit is explained. It include...
NEET neet - Physics
Asked by praveenpriya000079 | 18 Apr, 2024, 07:24: AM
ANSWERED BY EXPERTNEET neet - Physics
Asked by gouranshi84 | 17 Apr, 2024, 05:23: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by sojusvi | 17 Apr, 2024, 01:12: PM
ANSWERED BY EXPERT
