What is the direction of current through the rod in

(a) Figure 27.27b and

(b) Figure 27.27c?

(c) Is the direction of the force in Figure \(27.27 c\) in agreement with what we learned about the interaction of two parallel current-carrying wires in Section 27.3?

(d) If the particle moving alongside the wire in Figure 27.27 carries a negative charge, is the force exerted by the wire on the particle attractive or repulsive?

(e) Is this direction consistent with the direction of the forces exerted on each other by two parallel current-carrying wires?

Transcribed Image Text:

Figure 27.27 Observers E (at rest in the Earth reference frame) and M (moving in the Earth reference frame) observe a current-carrying wire. (a) Earth reference frame (observer E) To observer E, ions and electrons in wire have same charge density, so wire is electrically neutral and has no electric field: E = 0. E M current-carrying wire ion + A proper electron -Aproper (b) Reference frame of observer M To observer M, charge density of ions in wire is greater than Amper and that of electrons is smaller than proper so wire is positively charged, and E+0. EM proper