Friday 17 May 2013

A copper wire has diameter 0.5 mm and resistivity of


Question 6:
A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10−8 Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?
Solution:
Area of cross-section of the wire, A =π (d/2) 2
Diameter= 0.5 mm = 0.0005 m
Resistance, R = 10 Ω
We know that






∴ length of the wire = 122.72m
If the diameter of the wire is doubled, new diameter=2×0.5=1mm=0.001m
Let new resistance be Rʹ
 


∴ the new resistance is 2.5 Ω
 

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19 comments:

  1. Dázzlér ZX19 May 2015 at 05:51

    They have asked that how much the resistance will change, and not what will be the resistance?

    ReplyDelete
    Replies
    1. Unknown14 July 2016 at 07:26

      1/4 times

      Delete
    2. Unknown25 May 2017 at 06:47

      Yes..
      If the length is doubled and the diameter is reduced to half
      Will the resistance change? or be same?

      Delete
    3. Unknown23 December 2017 at 06:29

      After finding the resistance just substract it ....or u can't even do that

      Delete
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  2. Dázzlér ZX19 May 2015 at 06:01

    This comment has been removed by the author.

    ReplyDelete
  3. Unknown26 September 2015 at 23:19

    Sorry but your answere is wrong it should be 1.23m.
    Your mistake is at the square of 0.0005, it is 2.5.
    Still thanks.

    ReplyDelete
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  5. Unknown13 June 2017 at 23:46

    What will be the resistance if diameter is halved

    ReplyDelete
  6. Unknown22 July 2017 at 23:21

    I like to play Clash of Clans and I use http://myclashgems.com It really works! (mprBN)

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  7. Unknown10 October 2017 at 08:51

    This comment has been removed by the author.

    ReplyDelete
  8. buansing7923 March 2018 at 18:01

    How 10 minus 8 lost

    ReplyDelete
  9. Unknown23 June 2018 at 01:07

    Thanks

    ReplyDelete
  10. Unknown29 June 2018 at 01:13

    This solution wrong idiot

    ReplyDelete
  11. Unknown29 June 2018 at 01:30

    Sorry my mistake the ans is correct im idiot

    ReplyDelete
  12. Unknown17 July 2018 at 17:10

    Supppe thank u for this ways u to help us

    ReplyDelete

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