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Q.

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

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$H = \frac{V^{2}}{R} t; \frac{H_{S}}{H_{P}} = \frac{R / n}{nR} = \frac{R}{2 \times 2 R} = \frac{1}{4}$

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