In the figure 30-56, a metal rod is forced to move with constant velocity along
ID: 2213289 • Letter: I
Question
In the figure 30-56, a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0.294 T points out of the page. (a) If the rails are separated by 34.0 cm and the speed of the rod is 77.8 cm/s, what is the magnitude of the emf generated in volts? (b) If the rod has a resistance of 26.0 ? and the rails and connector have negligible resistance, what is the current in amperes in the rod? (c) At what rate is energy being transferred to thermal energy?
Explanation / Answer
a) emf = Blv = 0.294*.34*.778 = 0.078 V b) current = .078/26 = 2.99 mA c) rate = .00299^2*26 = 2.33*10^-4 W
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