Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Current Electricity question

2024 · Q171
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Current Electricity
  5. /2024 · Q171

Current Electricity question

2024 · Q171

NEETPhysicsCurrent ElectricityMCQ+4 / −1

A uniform metal wire of length lll has 10Ω10 \Omega10Ω resistance. Now this wire is stretched to a length 2l2l2l and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is

  1. A
    10Ω10 \Omega10Ω
  2. B
    5Ω5 \Omega5Ω
  3. C
    40Ω40 \Omega40Ω
  4. D
    20Ω20 \Omega20Ω
View written solutionFree

Correct answer: A

$R_0=10 \Omega$

After stretching its length upto $2l$

$$\begin{aligned} R_1 \& =n^2 R_0 \\ \& =4 R_0 \\ \& =40 \Omega \end{aligned}$$

NEET 2024 (Re-Examination) Physics - Current Electricity Question 4 English Explanation

$$R_{A B}=\frac{20 \times 20}{20+20}=10 \Omega$$

PreviousNext

More from Current Electricity

  • The given circuit shows a uniform straight wire AB of 40 cm length fixed at both ends. In order to get zero reading in the galvanometer G, the free end of J is to be placed from B at: Includes diagram2024 · MCQ
  • A certain wire A has resistance 81 Ω. The resistance of another wire B of same material and equal length but of diameter thrice the diameter of A will be :2023 · MCQ
  • A copper wire of radius 1 mm contains 1022 free electrons per cubic metre. The drift velocity for free electrons when 10 A current flows through the wire will be (Given, charge on electron =1.6×10−19C…2023 · MCQ
  • The emf of a cell having internal resistance 1Ω is balanced against a length of 330 cm on a potentiometer wire. When an external resistance of 2Ω is connected across the cell, the balancing length will be :2023 · MCQ
  • The magnitude and direction of the current in the following circuit is :- Includes diagram2023 · MCQ
  • If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by: Includes diagram2023 · MCQ
  • Resistance of a carbon resistor determined from colour codes is (22000±5%)Ω. The colour of third band must be :2023 · MCQ
  • The resistance of platinum wire at 0∘C is 2 Ω and 6.8 Ω at 80∘C. The temperature coefficient of resistance of the wire is :2023 · MCQ