JEE Advanced 2015 Paper 1 Physics Q17

Physics · Current Electricity

Problem

In an aluminum (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 2.7×10−8 Ω m2.7\times10^{-8}\,\Omega\,\mathrm m and 1.0×10−7 Ω m1.0\times10^{-7}\,\Omega\,\mathrm m, respectively. The electrical resistance between the two faces PP and QQ of the composite bar is

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