A cylindrical wire has a resistance R and resistivity rho If its len
2 views 0 purchase
Course
HBO Small Business en Ondernemerschap
Institution
HBO Small Business En Ondernemerschap
A cylindrical wire has a resistance R and resistivity rho If its length and diameter are BOTH cut
in half, what will be its resistance? 4R 2R R R/4 R/2 If its length and diameter are BOTH cut
in half, what will be its resistivity? 2rho rho rho/4 rho/2 4rho
Solution
a)R=4L/d2 ...
A cylindrical wire has a resistance R and resistivity rho If its length and diameter are BOTH cut
in half, what will be its resistance? 4R 2R R R/4 R/2 If its length and diameter are BOTH cut
in half, what will be its resistivity? 2rho rho rho/4 rho/2 4rho
Solution
a)R=4L/d2 this is the original resistance
now length and diameter are half means
l=l/2 ,d=d/2
Rnew =4(L/2)/((d/2)2)
Rnew/R =4(L/2)/((d/2)2)/4L/d2
Rnew/R =(1/2)/(1/4)/0.25 =2
Rnew =2R
so the answer is B
b)resistivity is a constant,so it remains same
so the answer is B
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller meejuhaszjasmynspe52866. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.27. You're not tied to anything after your purchase.