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[" An ac source is rated at "220V,50Hz" ...

[" An ac source is rated at "220V,50Hz" .The time "],[" taken for voltage to change from its peak value "],[" to zero is "],[[" (1) "50" sec "," (2) "0.02sec],[" (3) "5sec," (4) "5times10^(-3)sec]]

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