Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    I've got a question which says a 1.00m length of wire is stretched by 5% but the volume and resistivity stay the same.If the original diameter was 0.36mm,calculate the new cross-sectional area.

    Any help is greatly appreciated.
    Offline

    10
    You have the original length and Xsection area (from the diameter) so you can calculate the volume of the wire.
    After stretching you know the new length of wire is 1.05m (a 5% increase)
    You know the volume is the same as before so use this to find the new cross section area.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: October 30, 2011

University open days

  • University of Bradford
    All faculties Undergraduate
    Wed, 21 Nov '18
  • Buckinghamshire New University
    All Faculties Postgraduate
    Wed, 21 Nov '18
  • Heriot-Watt University
    All Schools Postgraduate
    Wed, 21 Nov '18
Poll
Black Friday: Yay or Nay?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.