A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
If the crosssection of a wire of fixed length is doubled, how does the resistance of that wire change? (this is for studying for my semester exam. I got the question wrong on one of my chapter tests so I'm trying to find out what the correct answer was)
A. Halved
B. Doubled (I know it's NOT this cause that was the wrong one)
C. Unchanged
D. Quadrupled
anonymous
 4 years ago
If the crosssection of a wire of fixed length is doubled, how does the resistance of that wire change? (this is for studying for my semester exam. I got the question wrong on one of my chapter tests so I'm trying to find out what the correct answer was) A. Halved B. Doubled (I know it's NOT this cause that was the wrong one) C. Unchanged D. Quadrupled

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Apart from using the right formula (there's one that relates the resistance of a wire to its length and crosssection), you could try an analogy. For currents and resistors, compraing the situation with water flows usually works. What would the equivalent of resistance be in a flowing river? And what would happen when the river suddenly becomes wider?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Would that make it halved?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes it would. A wider river/wire would allow the current to flow easier (and thus with less resistance). The formula I mentioned is \[R = \rho\frac{l}{A}\] (see e.g. http://www.physicsclassroom.com/class/circuits/u9l3b.cfm )
Ask your own question
Sign UpFind 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
 Engagement 19 Mad Hatter
 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.