Question

A metal rod of length 10 cm and a rectangular cross - section of 1 cm ×$\frac{1}{2}$​ cm is connected to a battery across opposite faces. The resistance will be

• A. maximum when the battery is connected across 1cm×$\frac{1}{2}$​ cm faces
• B. maximum when the battery is connected across 10cm×$\frac{1}{2}$​cm faces
• C. maximum when the battery is connected across 10cm× 1 cm faces
• D. same irrespective of the three faces

Answer 1

Answer: (A)

maximum when the battery is connected across 1cm×$\frac{1}{2}$​ cm faces

Answer 2

The correct option is (A): Resistance is inversely proportional to area.
So the resistance will be maximum when the battery is connected across 1cm× ($\frac{1}{2}$) cm faces