How do the following changes affect the answer to Exercise 28.2:

(a) reversing the current through wire \(1,\) 

(b) reversing the current through wire \(2,\)

(c) reversing the direction of the Ampèrian path?

Data from Exercises 28.2

Consider the Ampèrian path going through the collection of current-carrying wires in Figure 28.19. If the magnitude of the current is the same in all the wires, is the line integral of the magnetic field along the Ampèrian path positive, negative, or zero?

Figure 28.19 4 Amprian path