A candle flame is electrically conductive. An EHT will visibly separate its free charges, causing a current to flow in an external circuit.
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This is a Great experiment which I have used with A level students before, the flame "splits" in 2 which never fails to engage and leads to all sorts of discussion. This is a Great Resource complete with colour photos of the equipment and set-up. The correct weblink is http://www.practicalphysics.org/practical-physics/ions-flame as at January 2012
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