# Homework Help: Magnetic field at a point due to current carrying wires

1. Nov 29, 2007

### bilals

1. The problem statement, all variables and given/known data

2. Relevant equations

B =( $$\mu$$ * i * $$\phi$$ ) / (2 * $$\pi$$ * R)

3. The attempt at a solution

i wanted to add one more equation, but im having difficulty in writing them. whatever!!!

As you can see from the question there are 6 segments of current carrying wires.

For segment 1 which is labeled in the picture above, B = 0, because the wire goes directly towards the point.

For segment 2 (the semi-circular arc), the magnetic field is calculated using the equation above. where $$\phi$$ = $$\pi$$.

For segment 3, i calculated the B-field and i think its correct....it is 0.0000035969 Tesla.

For segment 4, the B-field is twice as much of segment 3.

the problem now is that i dont know how to calculate the field due to segments 5 and 6. Im not sure if they produce any magnetic field that act on point A.

so please if anyone could help as soon as possible.

Last edited: Nov 29, 2007