# Figure (mathrm{P} 27. 33) shows the arrangement we looked at in Example 27. 2: a metal bar

## Question:

Figure $$\mathrm{P} 27. 33$$ shows the arrangement we looked at in Example 27. 2: a metal bar $$0.20 \mathrm{~m}$$ long suspended from two springs, cach having a spring constant $$k=0.10 \mathrm{~N} / \mathrm{m}$$. Initially there is no current through the bar, and it is suspended at rest below the ceiling. With a current of $$0.45 \mathrm{~A}$$, the bar rises a distance $$d=1.5 \mathrm{~mm}$$. Suppose that the current is turned off, the bar drops down to its original position, and we attach a $$5.0-\mathrm{mg}$$ piece of plastic to the center of the bar. Now how much current must there be through the bar to make it rise a distance $$d=1.5 \mathrm{~mm} ? Data from Figure P27.33 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}$$.

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