Magnetic Field due to a finitely long wire

[Flyer888]

Homework Statement

https://imagizer.imageshack.us/v2/935x701q90/540/k2taHx.jpg

Homework Equations

The Attempt at a Solution

I think I got the idea to solve the B1 (the circular segment) and the ones that I wrote "zero", but I'm a bit confused on the straight ones (B2 and B3)...
I'm using the Biot-Savart law, but have no idea what goes inside the integral of (dl x r hat)/r²

 

[haruspex]

Try http://www.phys.uri.edu/gerhard/PHY204/tsl216.pdf

 

[Flyer888]

Try http://www.phys.uri.edu/gerhard/PHY204/tsl216.pdf

Thanks for the help!

Therefore, is it correct if the total magnitude of B is B1+B2+B3 (where B2 and B3 are equal and in same direction), and all of them have a direction pointing into the page?

 

[haruspex]

Thanks for the help!

Therefore, is it correct if the total magnitude of B is B1+B2+B3 (where B2 and B3 are equal and in same direction), and all of them have a direction pointing into the page?

Sounds right.