The wires below are infinitely long and some of them are with loops and semi loops. The current I is constant. What is the magnetic field in point O, when R is the distance from it?
In F, E and H, the magnetic field exerted by the terminal infinitely long wire is 0 because it is 180 degrees?
If the loop is a semi-circle, I use B/2? If the loop is a quarter of a circle, then B/4 and so on?
How to solve for G?
2. Relevant equations
3. The attempt at a solution
I included in my calculations the magnetic fields of both the infinite wire and the loop.
A: μI/2R Outwards
B: μI/2R + 2μI/4piR Outwards
C: μI/2R – 2μI/4piR Outwards
D: μI/2R – μI/2R +2μI/8piR = 2μI/8piR Inwards
E: 2μI/8piR Inwards
F: μI/2R + 2μI/16piR Inwards
H: μI/2R + 2μI/8piR + μI/2R Inwards