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In the arrangement shown, a conducting bar of
negligible resistance slides along horizontal, parallel,
frictionless conducting rails connected as shown to a
2.0-W resistor. A uniform 1.5-T magnetic field is
perpendicular to the plane of the paper. If L = 60 cm, at
what rate is thermal energy being generated in the
resistor at the instant the speed of the bar is equal to
4.2 m/s?
%3D
2.00
а.
8.6 W
b.
7.8 W
C.
7.1 W
d.
1.8 W
е.
9.3 W
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Transcribed Image Text:In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0-W resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L = 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s? %3D 2.00 а. 8.6 W b. 7.8 W C. 7.1 W d. 1.8 W е. 9.3 W
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