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NCERT Exemplar Solutions Class 10 Science Solutions for Electricity - Exercise in Chapter 12 - Electricity
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A cylindrical conductor of length l and uniform area of crosssection A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section ___________________ .
Answer:
(c) 2A
Explanation:
\rho =𝑅𝐴 / 𝑙
When Length doubles
\rho =𝑅𝐴 / 2𝑙
𝑅𝐴𝑙=𝑅𝐴 / 2𝑙
A=2A
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