Tuesday
March 3, 2015

Homework Help: Physics: Diameter of a nichrome wire

Posted by Sar on Thursday, September 9, 2010 at 5:24pm.

If 49 m of nichrome wire is to have a resistance of 13.0 ohms at 20C, what diameter wire should be used?

I've done this:
(108e-8)(49)/10.0 ohms = 5.29e-6m^2
Then 5.29e-6m^2/pi
then r = sqrt(1.68e-6m^2)
and got .00129 = 1.29e-3
1.29mm
r=2(1.29mm) = 2.58mm

But this is wrong. Any suggestions?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

physics - As part of a class project you are given 0.900 g of nichrome and asked...
Physics - The heating element of a simple heater consists of a 2.2m--long, 0....
Physics - Calculate the resistance per unit length of a nichrome wire, which ...
physics, university - A 50.0-g sample of a conducting material is all that is ...
physics - A wire has a resistance of 27.2 ohms. It is melted down, and from the ...
Physics - What length of #22 B&S gauge copper wire is needed to make a ...
physics - The resistivity of copper is 1.310^-9 ohms. What is the length of a ...
physics - a metal wire has a resistance of 8 Ohms at a temperature of 20 degrees...
physics - A toaster uses a Nichrome heating wire. When the toaster is turned on ...
physics - A toaster uses a Nichrome heating wire. When the toaster is turned on ...

Members