Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • The resistance of platinum wire at is <img alt="\mathrm{ 2\Omega }" src

The resistance of platinum wire at \mathrm{ 0^{\circ}C} is \mathrm{ 2\Omega }  and \mathrm{ 6.8\Omega } at \mathrm{ 80^{\circ}C }. The temperature coefficient of resistance of the wire is:

Option: 1

3 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1}


Option: 2

3 \times 10^{-3}{ }^{\circ} \mathrm{C}^{-1}


Option: 3

3 \times 10^{-2}{ }^{\circ} \mathrm{C}^{-1}


Option: 4

3 \times 10^{-1}{ }^{\circ} \mathrm{C}^{-1}


Answers (1)

best_answer

\begin{aligned} & R_T=R_{\circ}(1+\alpha T) \\ & 6.8=2[1+\alpha(80)] \\ & \alpha=\frac{3.4-1}{80}=\frac{2.4}{80}=3 \times 10^{-2}{ }^{\circ} \mathrm{C}^{-1} \end{aligned}

Posted by

vishal kumar

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

NEET UG 2026 irregularities under investigation; NTA says full cooperation being extended to agencies
anam-khan

NEET UG 2026 Tie-Breaking Rule Explained: Here’s how ranks are decided
anam-khan

NEET 2026: Odisha aspirant dies by suicide fearing failure

Latest Question