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\times10^8 \Omega m\text{and} 1.0\times10^{-7 }\Omega m,respectively. The electrical resistance between the two faces P and Q of the composite bar is [JEE Adv 2015 P1]

Current Electricity

Section: Physics

Question : 15 of 29

Marks: +1, -0

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

[JEE Adv 2015 P1]

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

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