JEE Mains · Physics · STD 12 - 3. current electricity
In the experiment of calibration of voltmeter, a standard cell of \(e.m.f\,\,1.1\,volt\) is balanced against \(440\,cm\) of potential wire. The potential difference across the ends of resistance is found to balance against \(220\,cm\) of the wire. The corresponding reading of voltmeter is \(0.5\,volt.\) The error in the reading of volmeter will be .................. \(volt\)
- A \(-0.15\)
- B \(0.15\)
- C \(0.5\)
- D \(-0.05\)
Answer & Solution
Correct Answer
(D) \(-0.05\)
Step-by-step Solution
Detailed explanation
In a voltmeter \(V \propto l\) \(\mathrm{V}=\mathrm{k} l\) Now, it is given \(\mathrm{E}=1.1\) \(volt\) for \(l_{1}=440\, \mathrm{cm}\) and \(V=0.5\) \(volt\) for \(l_{2}=220\, \mathrm{cm}\) Let the error in reading of voltmeter be \(\Delta \mathrm{V}\) then,…
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 wire of resistance \(R\) is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between points \(A\) and \(B\) is \(R / n\). The value of \(n\) is :
JEE Mains 2025 Medium - A thin circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity \(\omega\). If another disc of same dimensions but of mass \(\mathrm{M} / 2\) is placed gently on the first disc co-axially, then the new angular velocity of the system is _______.JEE Mains 2024 Hard
- The percentage errors in quantities \(P, Q, R\) and \(S\) are \(0.5\%,\,1\%,\,3\%\) and \(1 .5\%\) respectively in the measurement of a physical quantity \(A\, = \,\frac{{{P^3}{Q^2}}}{{\sqrt {R}\,S }}\) . the maximum percentage error in the value of \(A\) will be ........... \(\%\)JEE Mains 2018 Hard
- A system consists of two identical spheres each of mass \(1.5\, {kg}\) and radius \(50\, {cm}\) at the end of light rod. The distance between the centres of the two spheres is \(5\, {m}\). What will be the moment of inertia of the system about an axis perpendicular to the rod passing through its midpoint ? (in \({kgm}^{2}\))JEE Mains 2021 Hard
- Young’s moduli of two wires \(A\) and \(B\) are in the ratio \(7 : 4\). Wire \(A\) is \(2\, m\) long and has radius \(R\). Wire \(A\) is \(2\, m\) long and has radius \(R\). Wire \(B\) is \(1.5\, m\) long and has radius \(2\, mm\). If the two wires stretch by the same length for a given load, then the value of \(R\) is close to ......... \(mm\)JEE Mains 2019 Medium
- An object is placed beyond the centre of curvature \({C}\) of the given concave mirror. If the distance of the object is \({d}_{1}\) from \({C}\) and the distance of the image formed is \({d}_{2}\) from \({C}\), the radius of curvature of this mirror isJEE Mains 2021 Hard
More PYQs from JEE Mains
- Let \(A\) and \(B\) be two finite sets with \(m\) and \(n\) elements respectively. The total number of subsets of the set \(A\) is 56 more than the total number of subsets of \(B\). Then the distance of the point \(P ( m , n )\) from the point \(Q (-2,-3)\) isJEE Mains 2024 Medium
- The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is \(31.4 \,cm\). The diameter of wire is measured as \(2.4 \,cm\). The resistivity of the given wire is measured as \(x \times 10^{-3} \,\Omega cm\). The value of \(x\) is_______ [Take \(\pi=3.14]\)
JEE Mains 2022 Medium - Let \(C\) be the circle with centre at \((1, 1)\) and radius \(= 1\). If \(T\) is the circle centred at \((0, y),\) passing through origin and touching the circle \(C\) externally, then the radius of \(T\) is equalJEE Mains 2014 Hard
- The density and breaking stress of a wire are \(6 \times\) \(10^4 \mathrm{~kg} / \mathrm{m}^3\) and \(1.2 \times 10^8 \mathrm{~N} / \mathrm{m}^2\) respectively. The wire is suspended from a rigid support on a planet where acceleration due to gravity is \(\frac{1^{\text {rd }}}{3}\) of the value on the surface of earth. The maximum length of the wire with breaking is _______ \(\mathrm{m}\) (take, \(\mathrm{g}=\) \(\left.10 \mathrm{~m} / \mathrm{s}^2\right)\)JEE Mains 2024 Hard
- The number of real roots of the equation \(\mathrm{x}|\mathrm{x}-2|+3|\mathrm{x}-3|+1=0\) is :JEE Mains 2025 Medium
- \(n\) identical waves each of intensity \(I_0\) interfere with each other. The ratio of maximum intensities if the interference is \((i)\) coherent and \((ii)\) incoherent is :JEE Mains 2013 Medium