JEE Mains · Physics · STD 12 - 3. current electricity
The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are \(8 \Omega\) and \(10 \Omega\) respectively. After inserting in a hot bath of temperature \(400^{\circ} \mathrm{C}\), the resistance of platinum wire is _______.
- A \(2 \Omega\)
- B \(16 \Omega\)
- C \(8 \Omega\)
- D \(10 \Omega\)
Answer & Solution
Correct Answer
(B) \(16 \Omega\)
Step-by-step Solution
Detailed explanation
\(\text { Given } \mathrm{R}_0=8 \Omega, \mathrm{R}_{100}=10 \Omega\) \(\therefore \mathrm{R}_{100}=\mathrm{R}_0(1+\alpha \Delta \mathrm{T})\) \(\text { Also, } \mathrm{R}_{400}=\mathrm{R}_0\left(1+\alpha \Delta \mathrm{T}^1\right)\)…
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
- A Zener diode of breakdown voltage \(10 \mathrm{~V}\) is used as a voltage regulator as shown in the figure. The current through the Zener diode is _______.
JEE Mains 2024 Hard - Average force exerted on a non-reflecting surface at normal incidence is \(2.4 \times 10^{-4} \mathrm{~N}\). If \(360 \mathrm{~W} / \mathrm{cm}^2\) is the light energy flux during span of \(1\) hour \(30\) minutes. Then the area of the surface is _______.JEE Mains 2024 Hard
- Capacitance of an isolated conducting sphere of radius \(R_{1}\) becomes \(n\) times when it is enclosed by a concentric conducting sphere of radius \(R_{2}\) connected to earth. The ratio of their radii \(\left(\frac{ R _{2}}{ R _{1}}\right)\) is:JEE Mains 2022 Hard
- A red \(LED\) emits light at \(0.1\) watt uniformly around it. The amplitude of the electric field of the light at a distance of \(1\ m\) from the diode is....\( Vm^{-1}\)JEE Mains 2015 Medium
- A circular current loop of radius \(R\) is placed inside square loop of side length \(L\) \((L >> R)\) such that they are co-planar and their centers coincide. The permeability of free space is \(\mu_0\). The mutual inductance between circular loop and square loop is _______.JEE Mains 2026 Hard
- A particle is rotating in a circular path and at any instant its motion can be described as \(\theta = \dfrac{5t^4}{40} - \dfrac{t^3}{3}\). The angular acceleration of the particle after \(10\) seconds is _______ rad/s\(^2\).JEE Mains 2026 Medium
More PYQs from JEE Mains
- A number \(x\) is chosen at random from the set \(\{1, 2, 3, 4, .... , 100\}\) . Define the event: \(A =\) the chosen number \(x\) satisfies \(\frac{{(x - 10)(x - 50)}}{{(x - 30)}} \ge 0.\) Then \(P(A)\) isJEE Mains 2014 Hard
- Let \(L_1, L_2\) be the lines passing through the point \(\mathrm{P}(0,1)\) and touching the parabola \(9 x^2+12 x+18 y-14=0\). Let \(Q\) and \(R\) be the points on the lines \(\mathrm{L}_1\) and \(\mathrm{L}_2\) such that the \(\triangle \mathrm{PQR}\) is an isosceles triangle with base \(\mathrm{QR}\). If the slopes of the lines \(Q R\) are \(m_1\) and \(m_2\). then \(16\left(m_1^2+m_2^2\right)\) is equal to ..............JEE Mains 2024 Hard
- Consider a Disc of mass \(5 \mathrm{~kg}\), radius \(2 \mathrm{~m}\), rotating with angular velocity of \(10 \mathrm{rad} / \mathrm{s}\) about an axis perpendicular to the plane of rotation. An identical disc is kept gently over the rotating disc along the same axis. The energy dissipated so that both the discs continue to rotate together without slipping is _______ \(J\).
JEE Mains 2024 Hard - Number of \(4-\)digit numbers (the repetition of digits is allowed) which are made using the digits \(1, 2, 3\) and \(5\) , and are divisible by \(15\) , is equal to \(............\).JEE Mains 2023 Hard
- Let \(I = \int_a^b {\left( {{x^4} - 2{x^2}} \right)dx} \). If \(I\) is minimum then the ordered pair \((a, b)\) isJEE Mains 2019 Hard
- A nucleus has mass number \(A_1\) and volume \(V_1\). Another nucleus has mass number \(A_2\) and volume \(V_2\). If relation between mass number is \(A_2=4 A_1\), then \(\frac{V_2}{V_1}=\)_______.JEE Mains 2024 Hard