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A uniform wire of resistance R is bent in the form of circle. The ratio of equivalent resistance between P and Q, when angle $θ$ is 30^o, 60^o

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11 : 15

11 : 20

5 : 6

1 : 1

answer is B.

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Detailed Solution

$The resistance between two part subtending angle θ = \frac{Rθ (2 π - θ)}{4 π^{2}}$

so for 30⁰ and 60⁰

$\frac{30 (360 - 30)}{60 (360 - 60)} = \frac{11}{20}$

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