Current Electricity: Resistance Stretching MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow

Resistance StretchingMediumQuestion 31611

Question

A wire of resistance R is stretched to double its length (volume constant). New resistance is:

Volume = AL = constant. If L→2L, then A→A/2. R_new = ρ(2L)/(A/2) = 4ρL/A = 4R.