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In an aluminum (Al) bar of square cross ...

In an aluminum (Al) bar of square cross section, a square hole is drilled and is filled with iron as shown in the figure. The electrical resistivities of Al and Fe are`2.7 times 10^-8 Omegam` and `1.0 times 10^-7 Omega m` respectively. The electrical resistance between the two faces P and Q of the composite bar is :

A

`(2475)/(64)muOmega`

B

`(1875)/(64)muOmega`

C

`(1875)/(49)muOmega`

D

`(2475)/(132)muOmega`

Text Solution

Verified by Experts

The correct Answer is:
B
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