NEET · Physics · STD 12 - 3. current electricity
The resistance of platinum wire at \(0^{\circ}\,C\) is \(2\,\Omega\) and \(6.8\,\Omega\) at \(80^{\circ} \,C\). The temperature coefficient of resistance of the wire is :
- A \(3 \times 10^{-1}{ }\;^{\circ}\,C ^{-1}\)
- B \(3 \times 10^{-4}{ }\;^{\circ}C ^{-1}\)
- C \(3 \times 10^{-3}{ }\;^{\circ}C ^{-1}\)
- D \(3 \times 10^{-2}{ }\;^{\circ}C ^{-1}\)
Answer & Solution
Correct Answer
(D) \(3 \times 10^{-2}{ }\;^{\circ}C ^{-1}\)
Step-by-step Solution
Detailed explanation
\(R _{ T }= R _0\left[1+\alpha\left( T - T _0\right)\right]\) \(6.8=2[1+\alpha(80-0)]\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Two solid conductors are made up of same material, have same length and same resistance. One of them has a circular cross section of area \(A_{1}\) and the other one has a square cross section of area \(A_{2}\). The ratio \(\frac{A _{1}}{A _{2}}\) isNEET 2020 Easy
- If an electron in a hydrogen atom jumps from the \(3^{rd}\) orbit to the \(2^{nd}\) orbit, it emits a photon of wavelength \(\lambda\). when it jumps from the \(4^{th}\) orbit to the \(3^{rd}\) orbit, the corresponding wavelength of the photon will beNEET 2016 Medium
- The value of \(\gamma\left(=\frac{\mathrm{C}_{\mathrm{p}}}{\mathrm{C}_{\mathrm{v}}}\right),\) for hydrogen, hellium and another ideal diatomic gas \(X\)(whose molecules are not rigid but have an additional vibrational mode), are respectively equal toNEET 2019 Medium
- A light ray falls on a glass surface of refractive index \(\sqrt{3}\), at an angle \(60^{\circ}\). The angle between the refracted and reflected rays would be ....... \(^o\)NEET 2022 Medium
- A moving block having mass \(m,\) collides with another stationary block having mass \(4\,m\) . The lighter block comes to rest after collision. When the initial velocity of the lighter block is \(v,\) then the value of coefficient of restitution \(( e)\) will beNEET 2018 Medium
- The magnetic field of a plane electromagnetic wave is given by \(\overrightarrow{ B }=3 \times 10^{-8} \cos \left(1.6 \times 10^3 x +48 \times 10^{10} t \right) \hat{ j }\), then the associated electric field will be :NEET 2022 Medium
More PYQs from NEET
- Phosphoric acid ionizes in three steps with their ionization constant values \(K_{a_1}, K_{a_2}\) and \(K_{a_3}\), respectively,
While K is the overall ionization constant.
Which of the following statements are true?
A. \(\log K =\log K _{ a _1}+\log K _{ a _2}+\log K _{ a _3}\)
B. \(H _3 PO _4\) is a stronger acid than \(H _2 PO _4^{-}\)and \(HPO _4^{2-}\)
C. \(K_{a_1}>K_{a_2}>K_{a_3}\)
D. \(K_{a_1}=\frac{K_{a_3}+K_{a_2}}{2}\)NEET 2025 Medium - \(DNA\)-dependent \(RNA\) polymerase catalyses transcription on one strand of the \(DNA\) which is called theNEET 2016 Medium
- Given below are two statements:
Statement \(I\): A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid ( \(N\)-terminal).
Statement \(II\): Adult human haemoglobin, consists of \(4\) subunits (two subunits of \(\alpha\) type and two subunits of \(\beta\) type.)
In the light of the above statements, choose the correct answer from the options given below:NEET 2023 Medium - Two parallel infinite line charges with linear charge densities \(+\lambda\; \mathrm{C} / \mathrm{m}\) and \(-\lambda\; \mathrm{C} / \mathrm{m}\) are placed at a distance of \(2 \mathrm{R}\) in free space. What is the electric field mid-way between the two line charges?NEET 2019 Medium
- Which one of the following is a triploid cell ?NEET 2026 Easy
- Gadolinium belongs to \(4f\) series. Its atomic number is \(64.\) Which of the following is the correct electronic configuration of gadolinium?NEET 2015 Medium