CUET · PHYSICS · PYQ PAPER 2023
A metal rod of length 10 cm and a rectangular cross-section 1cm * 1/2 cm is connected to a 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 \(10 cm \times 1 cm\) faces.
- C maximum when the battery is connected across cm faces. \(10 cm^* 1 / 2\)
- D same irrespective of the three faces
Answer & Solution
Correct Answer
(A) maximum when the battery is connected across \(1 cm * 1 / 2 cm\) faces.
Step-by-step Solution
Detailed explanation
\(R = \rho \frac{L}{A}\) Case 1 (across \(1 \text{ cm} \times 1/2 \text{ cm}\) faces): \(L = 10 \text{ cm}\), \(A = 1 \text{ cm} \times 0.5 \text{ cm} = 0.5 \text{ cm}^2\) \(R_1 = \rho \frac{10}{0.5} = 20\rho\) Case 2 (across \(10 \text{ cm} \times 1 \text{ cm}\) faces):…
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