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 2.7×10^-8 Ωm and 1.0×10^-7 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is [2015] - VgyanHub

Question:

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 2.7×10^-8 Ωm and 1.0×10^-7 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is [2015]

108.1

Options :

a)2475/64μΩ
b)1875/64μΩ
c)1875/49μΩ
d)24575/132μΩ

Answer :

b)1875/64μΩ

Answer Steps :

Step:-1

Step:-2

Step:-3

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