Problem 3.242

Fig. 3.65 shows a toroidal solenoid whose cross-section is rectangular. Find the magnetic flux through this cross-section if the current through the winding equals $I=1.7$ A, the total number of turns is $N=1000,$ the ratio of the outside diameter to the inside one is $\eta=1.6,$ and the height is equal to $h=5.0 \mathrm{~cm}$