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JEE Advanced 2015 Paper 1

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Question : 18

Total: 60

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

2.7×108Ωmand1.0×10−7Ωm,respectively.

The electrical resistance between the two faces P and Q of the composite bar is

2475
64
μΩ
1875
64
μΩ
1875
49
μΩ
2475
132
μΩ

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