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Q.

If $R_{1} = 2 R_{2} = 4 R_{3} = 8 R_{4} = 16 R_{5},$ find the resistance in which maximum heat is generated, if key K is closed

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a

$R_{1}$

b

$R_{2}$

c

$R_{4}$

d

$R_{5}$

answer is D.

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Detailed Solution

All resistances are in parallel. The potential difference across each resistance is same.

$Δ H = I^{2} R T = \frac{V^{2} t}{R}$

$R_{5}$ is the smallest and generates maximum heat.

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