
#1
Mar1405, 04:17 PM

P: 15

I'm having some trouble with these two problems.
1. A 1.2mlong aluminum rod is rotating about an axis that is perpendicular to one end. A 0.16T magnetic field is directed parallel to the axis. The rod rotates through onefourth of a circle in 0.65 s. What is the magnitude of the average emf generated between the ends of the rod during this time? THis one i wasn't sure either but i tried using the N times the flux/time..but i wasn't sure if that was the right equation either. 2. A piece of copper wire is formed into a single circular loop of radius 14 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.56 T in a time of 0.66 s. The wire has a resistance per unit length of 3.4 x 102 /m. What is the average electrical energy dissipated in the resistance of the wire? For this one I was trying to do emf=BAcostheta/t and then i used that value in the equation P=V^2/R however, i can't get the right answer. 


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