Suppose the charge carriers flowing through the horizontal bar in Example 27.2 are negatively charged. In which direction must they flow so that the magnetic force exerted on the wire is still directed upward?

Data from Example 27.2

A metal bar \(0.20 \mathrm{~m}\) long is suspended from two springs, each with spring constant \(k=0.10 \mathrm{~N} / \mathrm{m}\), and the bar is in an external magnetic field directed perpendicular to the bar length (Figure 27.33). With a current of \(0.45 \mathrm{~A}\) in the bar, the bar rises a distance \(d=1.5 \mathrm{~mm}\). (a) In what direction is the current? \((b)\) What is the magnitude \(B\) of the external magnetic field?

Transcribed Image Text:

Figure 27.33 Example 27.2. k = 0.10 N/m d-1.5 mm x B into page x x x 1 = 0.45 A x x -0.20 m x x k = 0.10 N/m