Thursday

August 28, 2014

August 28, 2014

Posted by **Mary** on Thursday, September 27, 2007 at 11:06pm.

In this question do I use the following formula:

F = /q0/v(permeability of free space x I / 2piR) sin theta

- Physics -
**drwls**, Friday, September 28, 2007 at 11:03amThe field at the center is proportional to the number of turns, N, but the current is inversely proportional to then number of turns (because increasing N increases the resistance). Therefore N cancels out.

B = mu*N I /(2r)

(For a reference to that formula, see (Broken Link Removed)

r is the loop radius; R is the total resistance of all N turns

I = V/R

R = (resistance per length)* 2 N pi r

I = V/((resistance per length)* 2 N pi r)

B = mu*V/((resistance per length)* 4 pi r^2)

**Related Questions**

physics - A piece of copper wire has a resistance per unit length of 6.45*10-3 /...

Physics - A piece of copper wire has a resistance per unit length of 5.50 x 10...

Physic please check - A piece of copper wire has a resistance per unit length of...

Physics - A solenoid is formed by winding 25.3 m of insulated silver wire around...

Ap physics b - A piece of copper wire is formed into a single circular loop of ...

Physics - A piece of copper wire is formed into a single circular loop of radius...

Physic please help! - A piece of copper wire is formed into a single circular ...

college physics - How to do this problem? Compute the number of turns of wire on...

Physics repost - I know I have posted this question before but I have tried ...

Physics - (1) 45 micro coulombs of charge is passed through a wire in 35 seconds...