| ⇦ | 
| ⇨ |
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: - When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
- The ratio of the numerical value of the average velocity and average speed
- When 10¹⁹elecrons are removed from a neutral metal plate through some process,
- The de-Broglie wavelength of an electron in the first Bohr orbit is
- The potential energy of particle in a force field is U = A/r² – b/r, where A and B
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
- The ratio of the numerical value of the average velocity and average speed
- When 10¹⁹elecrons are removed from a neutral metal plate through some process,
- The de-Broglie wavelength of an electron in the first Bohr orbit is
- The potential energy of particle in a force field is U = A/r² – b/r, where A and B
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