A metal rod of length 10 cm and a rectangular cross section of 1cm×12cm is connected to a battery across opposite faces. The resistance will be

maximum when the battery is connected across 1 c m × 1 2 c m faces.

maximum when the battery is connected across 1 c m × 1 2 c m faces.

maximum when the battery is connected across 10 c m × 1 c m faces

maximum when the battery is connected across 10 c m × 1 2 c m faces.

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

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maximum when the battery is connected across $1 c m \times \frac{1}{2} c m$ faces.

maximum when the battery is connected across $10 c m \times 1 c m$ faces

maximum when the battery is connected across $10 c m \times \frac{1}{2} c m$ faces.

same irrespective of the three faces.

answer is A.

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$R = \frac{ρ L}{A}, R_{\max} \Rightarrow L_{\max} a n d A_{\min i m u m}$

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