A metal rod of length 10 cm and a rectangular cross-section of 
is connected to a battery across opposite faces. The resistance will be
A
maximum when the battery is connected across 
faces
faces B
maximum when the battery is connected across 
faces
faces C
maximum when the battery is connected across 
faces
faces D
same irrespective of the three faces
Text Solution
Verified by ExpertsThe correct answer is:
A
The resistance of wire is given by, 
For greater value of R, l must be higher and A should be lower and it is possible only when the battery is connected across 
(area of cross-section A).
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