A \(1.00-\mathrm{m}\) metal bar that has a mass of \(0.900 \mathrm{~kg}\) is initially pinned in place on an incline \(65.0^{\circ}\) above the horizontal (Figure P27.37). There is a \(0.850-\mathrm{T}\) magnetic field directed upward in the region around the bar, and metal contacts along the incline allow a current through the bar. If the coefficient of static friction between bar and contacts is \(0.200,(a)\) what are the minimum magnitude and the direction of the current that must pass through the bar to keep it from moving once it is released?

(b) Is there a maximum current that can be used in that same direction that will also hold the bar in place?

Data from Figure P27.37

Transcribed Image Text:

Figure P27.37 metal contacts bar M=0.200 65.0 B