The ratio of the equivalent|Current Electricity|JEEMAIN2021

JEE-MAIN 2021

27-08-2021 S2

Question

The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x : 8. The value of x is _______

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Solution

Rₑ₍open₎ = 3R / 2 Rₑ₍open₎ = 2 × (R × 2R) / 3R = 4R / 3 Rₑ₍open₎ / Rₑ₍closed₎ = (3R / 2) × (3 / 4R) = 9 / 8 ∴ x = 9

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JEE Main

Physics

Easy

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