Problem Description: A hiker is reading a compass under an overhead transmission line that is 5.1m above the ground and carries a current of 807A in a horizontal direction from North to South. Assume the earth's field is of the order 0.5*10^-4T. A) Determine the magnitude of the field produced by the transmission line at a point directly underneath B) Due to the transmission line, the compass will be deflected by a certain angle instead of pointing north. Find this angle in degrees Relevant equations: 1. Magnetic field of a straight conductor at distance 'd' = (μ/4π)*(2I/d) Attempt at Solution: Using the equation above and a given value for mu, I was able to find the strength of the magnetic field directly underneath the wire as being 3.164*10^-5 As for the next step, I'm totally lost. I was thinking of finding the forces on the compass due to the transmission line compared to Earth's field, and using vector lines to find the deflection, but I have no idea of the charge on the compass or anything. I also thought I could just take the relative directions and sizes of the earth's field and then draw vectors from there, but I don't know if that's allowed. What can I do? Thanks for your time!