A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
A. 0.32 A
B. 0.34 A
C. 0.37 A
D. 0.39 A
E. 0.43 A
Answer: A
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A. double. B. quadruple. C. be cut in half. D. be cut in fourth. E. not change.
What is the most abundant element for Earth as a whole?
What will be an ideal response?