Chapter 21, problem 2

Chapter 21, problem 2. 

The magnetic field B in a certain region is x₁ T, and its direction is that of the +z axis in figure 21.47.
(a) What is the magnetic flux across the surface abcd in the figure?

(b) What is the magnetic flux across the surface befc?

(c) What is the magnetic flux across the surface aefd?



(d) What is the net magnetic flux through all five surfaces that enclose the shaded volume?