A uniform conducting rod of length l and mass m sits atopa fulcrum, which is placed a distance l/4 from the rod'sleft-hand end and is immersed in a uniform magnetic fieldof magnitude B directed into the page (Fig. 20-69). Anobject whose mass M is 6.0 times greater than the rod's massis hung from the rod's left-hand end. What current (directionand magnitude) should flow through the rod in order forit to be “balanced" (i.e., be at rest horizontally) on thefulcrum? (Flexibleconnecting wires whichexert negligible forceon the rod are notshown.)BmMFIGURE 20-69Problem 83.

Given data: The length of the rod is l. The mass of the rod is m. The mass of the object is M. The…

Answered: A uniform conducting rod of length l…

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