Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • A wire of resistance R, length l and uniform area of cross-section A is stretched till its length becomes double. It is then cut into three pieces of equal length which are connected in parallel. Find the net resistance of the combination in terms of t

A wire of resistance R, length l and uniform area of cross-section A is stretched till its length becomes double. It is then cut into three pieces of equal length which are connected in parallel. Find the net resistance of the combination in terms of the resistance R.|

 

 
 
 
 
 

Answers (1)

Given,
 Resistance = R
 length = l
Area of cross section = A
when the wire is stretched to 2l
length become = 2l 
Area of the cross-section will be A/2
The new resistance of wire
R_{n}= 4R
then the wire is cut into three-piece of the same length
then the new length of each piece = \frac{l}{3}
then Resistance of each piece = \frac{R_{n}}{3}= \frac{4}{3}R
When three such resistance are connected in parallel

Net Resistance = \frac{4}{9}R

Posted by

Safeer PP

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Class 12 board exams 2025 to have 50% competency-based questions; no change in 10th
anam-khan

CBSE Class 12 board exams 2024 over; expected result date, trends of last 10 years
anam-khan

CBSE Class 12 accountancy board exam analysis 2024 out; paper rated easy, balanced

Latest Question