Name: Problem 3 (20 pts) A 1-m-long metal bar is pulled to the right at a steady

Question

Name: Problem 3 (20 pts) A 1-m-long metal bar is pulled to the right at a steady 5.0 m/s perpendicular to a uniform, 0.50-T magnetic field. The bar rides on parallel metal rails connectedX through a 25-, resistor , so the apparatus makes a complete circuit. Ignore the resistance of the bar and the rails. (l × Part A (10 pts) Calculate the magnitude of the emf induced in the circuit. Part B ( 5 pts) Find the direction of the current induced in the circuit. clockwise counterclockwise Part C (5 pts) Assuming that the rails have no resistance, what is the most accurate qualitative description of the motion of the rod? The rod will accelerate but the magnitude of the acceleration will decrease with time; the velocity of the rod will approach but never exceed a certain terminal velocity Under these idealized conditions the rod will experience constant acceleration and the velocity of the rod will increase indefinitely. The rod will accelerate indefinitely with acceleration proportional to its (increasing) velocity. D 4

Explanation / Answer

(a) induced emf= BLV

e=0.5*1*5

e=2.5 V

(b)using Flemings right hand rule, direction of current is counterclockwise

(c)the rod will acelerate and the magnitude of acceleration will decrease with time and velocityof rod will not exceed a certain terminal velocity limit. so option a is correct.

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