AP EAMCET · PHYSICS · Current Electricity
A block has dimensions \(1 \mathrm{~cm}, 2 \mathrm{~cm}\) and 3 cm . Ratio of the maximum resistance to minimum resistance between any pair of opposite faces of the block is
- A \(9: 1\)
- B \(1: 9\)
- C \(18: 1\)
- D \(6: 1\)
Answer & Solution
Correct Answer
(A) \(9: 1\)
Step-by-step Solution
Detailed explanation
Resistance, \(\mathrm{R}=\rho \frac{l}{\mathrm{~A}} \Rightarrow \mathrm{R} \propto \frac{l}{\mathrm{~A}}\) \(\therefore \mathrm{R}_{\max }=\rho \cdot \frac{l_{\max }}{\mathrm{A}_{\min }}=\rho \cdot \frac{3}{1 \times 2}=\frac{3 \delta}{2}\)…
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