Learning Goal: To apply Ampere's law to find the magnetic field inside an infinite solenoid. Which figure shows the loop that the must be used as the Amperean loop for finding Bin (r) for r inside the solenoid? In this problem we will apply Ampere's law, written B(T) . di = Ho Lend, to calculate the magnetic field inside a very long solenoid (only a relatively short segment of the solenoid is shown in the pictures). The segment of the solenoid shown in (Figure 1) has diameter D, and n turns per unit length with each carrying current I. It is usual to assume that the component of the current along the z axis is negligible. (This may be assured by winding two layers of closely spaced wires that spiral in opposite directions.) From symmetry considerations it is possible to show that far from the ends of the solenoid, the magnetic field is axial. View Available Hint(s) O C Submit Previous Answers Correct Part B Assume that loop B (in the Part A figure above) has length L along k (the z direction). What is the loop integral in Ampere's law? Assume that the top end of the loop is very far from the solenoid (even though it may not look like it in the figure), so that the field there is assumed to be small and can be ignored. Express your answer in terms of Bin, L, and other quantities given in the introduction. x X6 8 x Vx x x 1X X . 10 Figure f B . di = H NIdl . . . . . .. . Of. Submit Previous Answers Request Answer Cross section of a segment of the solenoid with n turns X Incorrect; Try Again; 8 attempts remaining per unit length The correct answer does not depend on; NI, dl, Ho