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To spin a magnet submerged in mercury...

Externet
in Classical Physics

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Which one demands more force to spin if held submerged in mercury; a magnet or a plain iron piece ?

-Being both equal shape, size, speed, depth...

The moving magnet will induce electric currents in the mercury, which will generate an opposing magnetic field.

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Yes, mercury can behave as a conductor crossing the lines of force of the spinning magnet, 'shortcircuiting' the current generated. Will that generate heat that will warm up the mercury; in the same amount of extra power needed to spin it compared to a non-magnet iron piece ?

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