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Question
State the law of area of cross-section for an electric resistance.
Law
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Solution
For conductors of the same material, length and temperature, the resistance is inversely proportional to the area of cross-section.
Thus, `R ∝ 1/A`, or `R = ρl/A`.
Therefore, `R_1/R_2 = A_2/A_1`.
If the area of cross-section is doubled, the resistance becomes half.
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