Question

(11 pts) You arrange two wires, a resistor, and a metal bar to form a complete circuit like the one on the right. The resistor has a resistance of 54 Ω. You place the circuit inside a uniform magnetic field of 0.64 T that points into the page. There is no source of emf in this circuit when the bar is not moving.
a. (3 pts) The bar has a length of 0.14 m and is 0.23 m away from the resistor. Before the bar starts moving, what is the magnetic flux through the circuit?
b. (3 pts) The bar starts moving away from the resistor with a speed of 0.85 m/s. What is the motional emf that the bar’s motion will induce?
c. (4 pts) When the bar is 0.36 m away from the resistor, you move it
from 0.36 m back to its starting position 0.23 m away from the resistor in a time interval of 0.22 s. If you wired a multimeter in series with the resistor, what is the average current the multimeter would measure during this 0.22s return trip?
d. (1 pts) What is the direction of the current through the resistor while you are moving the bar back to its starting position? (While the bar is moving toward the resistor.)

Answer 1

Solution is self explanatory.

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