1. The problem statement, all variables and given/known data What are the magnetic field strength and direction at the dot in Figure Ex32.8, in which v = 3.0*10^7 m/s? Figure Ex.32.8 is attached to the this post. r = 0.02828 m m0/4pi = 10^-7 T v = 3.0*10^7 m/s q = 1.60217653*10^-19 C 2. Relevant equations Biot-Savart Law (attached), can't really type it... 3. The attempt at a solution Ok. It's probably a very simple problem and it makes me feel really bad 'cause I can't solve it... I've tried to solve it with the Biot-Savart Law (check attach) with the values I mentioned above I'm sure I calculated the cross product wrong.. How would I calculate it in this case? Thanks in advance.