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In the drcult shown in the figure below the capacitor has capacitance C = 30 μF and is initlally charged to 100 V with the polarity shown. The resistor Ro has resistance 10Ω. At time t=0 the switch Is closed. The small drcult is not connected in any way to the large one. The wire of the small circuit has a resistance of 1.0 fl/rn and contains 28 loops. The large drcult Is a rectangle 2.0 m 1,4.0 , whIle the small one has dImenslons a = 10.0 cm and la 20.0 cm. The distance c is 5.0 cm. (The figure Is not drawn to scale.) Both circuits are held statIonary. Assume that only the wire nearest the small drcult produces an appreclable magnet, field through It.

2382_Find the current in the large circuit.png


(a) Find the current in the large circuit 100 μs after S closed.

(b) Find the current in the small circuit 100 μs after S is closed.

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