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Does anyone know what size-range of metal particles can be driven by either electrical field or magnetic field? For example, should the size be nano-meter range or micrometer?

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    $\begingroup$ That depends by what you mean by driven and also how strong the fields are. $\endgroup$ – J. Shupperd Sep 21 '16 at 18:27
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There is almost no limit to the size of a "particle" that can be moved by a magnetic field. See for example this picture (source)

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which shows an entire hospital gurney being sucked into an MRI scanner. In this case the patient was injured but survived. Not all are that lucky.

Bottom line: with a sufficiently strong (and diverging) field, a ferromagnetic "particle" can be very large, and yet be moved.

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