1. Two Identical wires denoted A & B are part of an electric circuit and therefore carry some currents. The wires are characterized by resistance per unit length,r, and both have length, L, each are spaced by a distance, a. What is the magnitude, F, of the force the wires exert on each other? Is this force an attractive force? For the given resistance, R of the resistor, what should be the length, L, to achieve maximum possible, F,?(adsbygoogle = window.adsbygoogle || []).push({});

Equations i thought might be useful..:

E=I*((r*L/2) + R)

My attempt:

Since..

I =emf/2rL+R

emf=I*((r*L/2) + R)

Then the force is equal to length, by current, by magnetic field. Because the current is going in the same direction in the two wires it will be an attraction force.

When you get Force as a function of L,

F = (µ0 *E^2)/(2*pi*a*r^2*L) where

µ0=permeability

pi = 3.141592....

Im unsure if this is even right, and where I go from here.. all help is appreciated..

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Force between identical wires in a circuit (1st post)

**Physics Forums | Science Articles, Homework Help, Discussion**