A classic demonstration illustrating eddy currents is performed by dropping a pe

Question

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 it has a terminal velocity of 10 cm/s. The length of the pipe is 80 cm. What is the magnitude of the magnetic force on the magnet when it is falling at the terminal velocity?

A) 0.35 N B) 0.79 N C) 0.97 N D) 0.69 N E) None of these is correct.

Explanation / Answer

velocity is constant so net force acting the magnet is Zero

   up ward force on the magnet = F = mg= 0.07 x 9.8 = 0.69 N

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