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Current Electricity question

2019 · 12 Jan · Shift 1 · Q56
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Current Electricity question

2019 · 12 Jan · Shift 1 · Q56

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
In a meter bridge, the wire of length 1 m has a non-uniform cross-section such that, the variation dRdℓ{{dR} \over {d\ell }}dℓdR​ of its resistance R with length ℓ\ellℓ is dRdℓ∝1ℓ{{dR} \over {d\ell }} \propto {1 \over {\sqrt \ell }}dℓdR​∝ℓ​1​. Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP ? JEE Main 2019 (Online) 12th January Morning Slot Physics - Current Electricity Question 263 English
  1. A
    0.3 m
  2. B
    0.25 m
  3. C
    0.35 m
  4. D
    0.2 m
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