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?
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