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NEET 2024
Exam
NEET
Year
2024
Subject
Physics
Chapter
Current Electricity

NEET 2024 · Physics · Current Electricity

A uniform metal wire of length / has 10 resistance. Now this wire...

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

Options

  1. A10Ω10 \Omega
  2. B5Ω5 \Omega
  3. C40Ω40 \Omega
  4. D20Ω20 \Omega

Correct answer

A. 10Ω10 \Omega

Step-by-step solution

R0=10ΩR_0=10 \Omega After stretching its length upto 2l R1=n2R0R_1=n^2 R_0 =4R0=4 R_0 =40Ω=40 \Omega A uniform metal wire of length / has 10 resistance. Now this wire is stretched to a length 2 / and then bent to form a
RAB=20×2020+20=10ΩR_{A B}=\frac{20 \times 20}{20+20}=10 \Omega
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