2. A circuit of resistance R is made by a conducting wire shaped as a 3/4 circle (black line, see figure) and a rotating

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2 A Circuit Of Resistance R Is Made By A Conducting Wire Shaped As A 3 4 Circle Black Line See Figure And A Rotating 1 (155.55 KiB) Viewed 49 times

2. A circuit of resistance R is made by a conducting wire shaped as a 3/4 circle (black line, see figure) and a rotating metal bar (brown line in the figure) that connects the center of the circuit with the circle. The metal bar is moving with a constant speed v; the radius of the circle is a. A uniform magnetic field of magnitude Bo crosses the complete circle as shown in the figure (green crosses, the field is into the page). R po a. In what direction is the current flowing in the circuit, explain in detail your reason- ing (1 point). b. Calculate the magnetic flux as a function of time in the circuit (1 point). c. Calculate the emf in the circuit (1 point). d. Obtain the magnitude of the current in the circuit (1 point).