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Self Induction

114.An electr...

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114.An electric heater has three windings. If two windings are connected in parallel and third is connected to them in series, then with various combinations , the water in the vessel begins to boil in 40, 45 and 72 minutes. The time taken to begin boiling if all windings are connected in series is Ts and if all are connected in parallel is Tp. Find ((Ts:Tp)-4)

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