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Current Electricity question

2015 · Shift 1 · Q56
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Current Electricity question

2015 · Shift 1 · Q56

JEE AdvancedPhysicsCurrent ElectricityMultiple correct+4 / −2
In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure. The electrical resistivities of Al and Fe are 2.7 ×\times× 10 −-− 8 Ω\OmegaΩ m and 1.0 ×\times× 10 −-− 7 Ω\OmegaΩ m, respectively. The electrical resistance between the two faces P and Q of the composite bar is JEE Advanced 2015 Paper 1 Offline Physics - Current Electricity Question 21 English
  1. A
    247564μΩ{{2475} \over {64}}\mu \Omega642475​μΩ
  2. B
    187564μΩ{{1875} \over {64}}\mu \Omega641875​μΩ
  3. C
    187549μΩ{{1875} \over {49}}\mu \Omega491875​μΩ
  4. D
    2475132μΩ{{2475} \over {132}}\mu \Omega1322475​μΩ
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