Question
Download Solution PDFIf the length of a copper wire is increased by twice, then its resistivity will be
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCalculation:
Given:
The length of the copper wire is increased by twice.
Using the formula for resistivity: ρ = R × A / L
Resistivity (ρ) depends only on the material and is independent of changes to the length (L) or cross-sectional area (A).
⇒ Increasing the length of the wire does not affect resistivity.
∴ Resistivity remains the same.
The correct answer is Option 3: Same.
Last updated on Jul 8, 2025
->UPSC NDA Application Correction Window is open from 7th July to 9th July 2025.
->UPSC had extended the UPSC NDA 2 Registration Date till 20th June 2025.
-> A total of 406 vacancies have been announced for NDA 2 Exam 2025.
->The NDA exam date 2025 has been announced. The written examination will be held on 14th September 2025.
-> The selection process for the NDA exam includes a Written Exam and SSB Interview.
-> Candidates who get successful selection under UPSC NDA will get a salary range between Rs. 15,600 to Rs. 39,100.
-> Candidates must go through the NDA previous year question paper. Attempting the NDA mock test is also essential.