The outer coil of wire is 10 cm long, 2 cm in diameter, wrapped tightly with one
ID: 2094435 • Letter: T
Question
The outer coil of wire is 10 cm long, 2 cm in diameter, wrapped tightly with one layer of 0.5-mm-diameter wire, and has a total resistance of 1.0 ?. It is attached to a battery, as shown, that steadily decreases in voltage from 12 V to 0 V in 0.5 s, then remains at 0 V for t > 0.5 s. The inner coil of wire is 1 cm long, 1 cm in diameter, has 10 turns of wire, and has a total resistance of 0.01 ?. It is connected to a current meter.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
A. As the voltage to the outer coil begins to decrease, in which direction (left-to-right or right-to-left) does current flow through the meter? Explain.
B. Draw a graph showing the current in the inner coil as a function of time for 0 ? t ? 1 s. Include a numerical scale on the vertical axis.
Explanation / Answer
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