Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 16

The bar AA in Fig. 5-31 serves as a conducting path (such as the blade of a circuit breaker) for the current I in two very long parallel lines. The lines have a radius b and are spaced at a distance d apart. Find the direction and the magnitude of the magnetic force on the bar.
Fig Force on conducting bar (Problem P5-20)