Question:
A metal rod of length 10 cm and a rectangular cross-section of 1 cm × 1/2 cm is connected to battery across opposite faces. The resistance will be
(a) maximum when the battery is connected across 1 cm × 1/2 cm faces
(b) maximum when the battery is connected across 10 cm × 1 cm faces
(c) maximum when the battery is connected across 10 cm × 1/2 cm faces
(d) same irrespective of the three faces
Solution:
The correct answer is (a) maximum when the battery is connected across 1 cm × 1/2 cm faces