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3MV/m is needed to produce ionisation of air. For a 1cm gap, this implies that you would need something like 30kv. With a sharply pointed electrode, this could be less but it would have to be about 15kV.Your 1.5V cell can provide, say, 1A - which is 1.5W. The current for 1.5W at 15kV would be only 0.1mA. That's the sort of current which your 1.5 cell could provide at high voltage and is what you should use in your calculations. (I haven't included the inefficiency of the voltage converter circuit here)I think that makes the force about 6mN.