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Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is

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a

2 : 1

b

1 : 2

c

4 : 1

d

1 : 4

answer is D.

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Detailed Solution

In series, .the equivale[t resistance = 2 AIn parallel, the equivalent resistance = (R / 2)Power in series Ps=V22RPower in parallel Pp,= V2(R/2)=2V2R∴ PSPP=14

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Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is