Use the Following Figure for the Next Problem:
-A $\times$

question 31

Multiple Choice

Use the following figure for the next problem:
-A classic demonstration illustrating eddy currents is performed by dropping a permanent magnet inside a conducting cylinder.The magnet does not go into free fall.Instead it reaches terminal velocity and can take a few seconds to drop a length of about a meter.Suppose the mass of the magnet is 70 g and width of 1.0 cm.It falls with a terminal velocity of 10 cm/s and the length of the pipe is 80 cm.The magnitude of the Joule heating from the eddy currents is approximately

• A)0.55 J
• B)8.8 \(\times\) 10^-5 J
• C)1.1 J
• D)1.8 \(\times\) 10^-4 J
• E)None of these is correct.

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