| ⇦ | 
| ⇨ |
The temperature coefficient of a resistance wire is 0.00125 per degree. The resistance at 300 K is 1 Ω. At what temperature its resistance will be 2Ω?
Options
(a) 1154 K
(b) 1127 K
(c) 600 K
(d) 1400 K
Correct Answer:
1127 K
Explanation:
Temperature = 300 K = 300 – 273 = 27°C
R₂₇ = R₀ (1 + 27 α) ⇒ 1 = R₀ (1 + 27 α)
Rt = R₀ (1 + αt) ⇒ 2 = R₀ (1 + αt)
2 / 1 = (1 + αt) / (1 + 27 α) ⇒ 1 + αt = 2 + 54α
⇒ αt = 1 +| 54 α ⇒ 0.00125t = 1 + 54 × 0.00125
⇒ t = 854°C = 854 + 273 = 1127 K
Related Questions: - A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where
- The wetability of a surface by a liquid depends primarily on
- A proton is moving in a uniform magnetic field B in a circular path of radius a
- The threshold wavelength for photoelectric emission from a material is 4800 Å.
- If radius of earth’s orbit is made 1/4, the duration of a year will become
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where
- The wetability of a surface by a liquid depends primarily on
- A proton is moving in a uniform magnetic field B in a circular path of radius a
- The threshold wavelength for photoelectric emission from a material is 4800 Å.
- If radius of earth’s orbit is made 1/4, the duration of a year will become
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply