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## Homework Statement

A long (effectively infinite) wire segment

is connected to a quarter of a circular arc with

radius a. The other end of the arc is connected

to another long horizontal wire segment. The

current is flowing from the top coming down

vertically and flows to the right along the pos-

itive x-axis. I have included the image below.

I = 7.5A, a = 0.69 m. Find the magnetic field at O?

## Homework Equations

B = μ0 * I / 2a

## The Attempt at a Solution

As far as I understand since we only consider the arc part then I use the formula from above but I am not getting the right answer.

B = 4∏ * 10^-7 * 7.5 / 2*0.69 = 6.8295 N/m