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The motion of copper plate is damped whe...

The motion of copper plate is damped when it is allowed to oscillate between the two plates of a magnet. What is the cause of this damping?

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The damping is due to eddy currents induced in the copper plate. If slots are cut in the plate, the eddy current loops become much shorter-as a result, the net value of the eddy current decreases. Then the damping becomes less.
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