An aluminium rod of length 3.14 {\m} is of square cross-section 3.14 \times 3.14 {\mm}^2. What should be the radius of 1 {\m} length of another rod of same material to have equal (same) resistance?

CUSAT 2022 BTech Solved Paper Shift 2

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An aluminium rod of length 3.14m is of square cross-section 3.14×3.14mm2. What should be the radius of 1m length of another rod of same material to have equal (same) resistance?

2‌mm
4‌mm
1‌mm
6‌mm

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