Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

richyw

  • 2 years ago

Consider a uniform metal ring. Between points A and B a resistance of \(20\Omega\) is measured. What is the resistance between points A and C?

  • This Question is Closed
  1. richyw
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1350534340500:dw|

  2. richyw
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1350534451786:dw|

  3. richyw
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so I set it up like I just drew above. The answer is \(20 \Omega\) but I can't figure out why, I keep getting \(15\Omega\). I know from A to B has resistance \(20\Omega\) so I put\[R_{AB}=\frac{2R(R+R)}{2R+(R+R)}=\frac{4R^2}{4R}=R=20\Omega\]So this is the value of R right? Then I do the same thing for between A & C and get\[R_{AC}=\frac{R(2R+R)}{R+(2R+R)}=\frac{3R^3}{4R}=\frac{3}{4}R=15\Omega\]

  4. richyw
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    does anyone see where I am going wrong?

  5. akash123
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    answer is 20 ohm?

  6. akash123
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    in 2nd expression...3/4 R...why u r putting R=20 ohm?

  7. akash123
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    u have been given...resistance between points A and B is 20 ohm.. but u r using R(Ac) or R(CB)= 20 ohm....which is wrong.

  8. akash123
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    does it help u?

  9. Algebraic!
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Are the lengths given more precisely?

  10. Algebraic!
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    like A and B are halfway around the circle, and C is 1/4 the way from A?

  11. Algebraic!
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you there?

  12. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.