Chapter 32, Problem 7Q

Figure 32-23 shows a face-on view of one of the two square plates of a parallel-plate capacitor as well as four loops that are located between the plates. The capacitor is being discharged. (a) Neglecting fringing of the magnetic field, rank the loops according to the magnitude of ${\displaystyle \oint \stackrel{\to }{B}\cdot d\stackrel{\to }{s}}$ along them, greatest first. (b) Along which loop, if any, is the angle between the directions of $\stackrel{\to }{B}$ and $d\stackrel{\to }{s}$ constant(so that their dot product can easily be evaluated)? (c) Along which loop, if any, is B constant (so that B can be brought in front of the integral sign in Eq. 32-3)?

Figure 32-23 Question 7.