I uploaded a photo to help explain the question, basically the blue rod is a -ve charged rod ( high voltage) gray one is metal and the brown is also metal but it's grounded , if gap A and B are filled with air , the high voltage will break down the air in both gaps and make 2 sparks in both gaps , but what if gap A was filled with water ( or a liquid with lower dielectric constant) , gap B with air, and the voltage is not high enough break down the water , can the charged rod induce a charge on the metal rod in the middle high enough to break the air in gap B making a spark in gap B only , leaving the middle metal rod +ve charged
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