# Homework Help: ED problem

1. Jul 28, 2010

### Petar Mali

1. The problem statement, all variables and given/known data
Is given two parallel conductors of equal and finite length $$L$$. The distance between them is $$a$$. On these conductors flow constant currents $$I_1$$, $$I_2$$ in same dirrections. If the line which connecting their centars built angle $$\alpha$$ whith dirrection of conductor find the force that the first conductor interract to second.

2. Relevant equations

3. The attempt at a solution

In solution is force given by

$$\vec{F}_{21}=I_2\int^{\frac{L}{2}+actg\alpha}_{-\frac{L}{2}+actg\alpha}dz\vec{e}_z\times \vec{B}_1$$

Why the boundaries are $$-\frac{L}{2}+actg\alpha$$ and $$\frac{L}{2}+actg\alpha$$?

Tnx for your answer!
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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