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Statement of a problem № 3759

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Two heater coils of power P1 and P2 (resistance R1 and R2 , respectively) take individually time t1 and t2 to boil a fixed quantity of water. Find the time t in terms of t1 and t2 , when they are connected to the mains in (a) series and (b) parallel to boil the same quantity of water.

Solution:
Two heater coils of power P1  and P2  (resistance R1  and R2 , respectively) tak

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