1.

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 2.7×10−8Ω−m and 1.0×10−7 Ω−m, respectively. The electrical resistance between the two faces P and Q of the composite bar is

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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 2.7×108Ωm and 1.0×107 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is







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