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a number of capacitors, each of capactiance 1uf and each one of which gets punctured if a potential difference just exceeding 500 volt is applied.are provided .Then an arrangement suitable for giving a capacitor of capacitance 3uf across which 2000 volt may be applied requirs at least
first for 2000V we have to require 2000/500 = 4 resistor in series.equivalent of this = ¼ uFfor 3uF we will require 12 such series combinationThen no of capacitor = 12*4 = 48Hope it clears.
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