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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.

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asked Mar 31, 2018 in Physics by shabnam praween (19,050 points) ● 5 ● 6 ● 68

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

(a) 2475/64μΩ  

(b) 1875/64 μΩ  

(c) 1875/49 μΩ  

(d) 2475/132μΩ 

1 Answer

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answered Mar 31, 2018 by santoshjha (25,550 points) ● 4 ● 5 ● 6
selected Apr 1, 2018 by Vikash Kumar
 
Best answer

RAf and Rfe are Parallel to each other

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