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## Homework Statement

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

## 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)/r

^{2}

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