Externet Posted December 29, 2009 Share Posted December 29, 2009 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... Link to comment Share on other sites More sharing options...
Mr Skeptic Posted December 29, 2009 Share Posted December 29, 2009 The moving magnet will induce electric currents in the mercury, which will generate an opposing magnetic field. Link to comment Share on other sites More sharing options...
Externet Posted December 30, 2009 Author Share Posted December 30, 2009 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 ? Link to comment Share on other sites More sharing options...
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