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A geyser containing certain amount of wa...

A geyser containing certain amount of water has two filaments of resistances `R_(1) `and `R_(2)` When `R_(1)` filament'is switched on while `R_(2)` is switched off, water boils in time t, and 't_o' when otherwise. Find the times when
(1) both filaments are in series, and
(ii) both filaments are in parallel

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