Created by StemPy LabAn electric lamp is rated , . It has to be run at its rated values from a , AC supply. To do this, a pure inductor is connected in series with the lamp. Treat the lamp as a pure resistor. The inductance needed is closest to
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← A long straight wire carries a current of 10 A. A rectangular loop lies in the same plane, as shown in the figure. Its two long sides, each 20 cm, are parallel to the wire, and its short sides are 10 cm. The nearer long side is 5 cm from the wire. The loop carries 5 A, flowing in its nearer side in the same direction as the current in the wire. The net magnetic force on the loop isA small bulb sits at the bottom of a pond of clear water, 2.0 m below the surface. The refractive index of water is 4/3. Seen from above, light comes out of the water only through a bright circle on the surface, as shown in the figure. The radius of this circle is closest to →
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