x.øi5udying a coil of unknown inductance and internal resistance, you connect it in series with a 25.0-{\rm V} battery and a 150-\Omegaresistor. You then place an oscilloscope across one of these circuitelements and use the oscilloscope to measure the voltage across thecircuit element as a function of time. The result is shown in thefigure (Intro 1 figure) .


Part A
Across which circuit element (coil or resistor) is the oscilloscope connected?


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Part B
How do you know this?
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Part C
Find the inductance of the coil.
Express your answer using two significant figures.
L =
\rm H

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Part D
Find the internal resistance of the coil.
r =

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