Question

A cylindrical conductor of length 'l' and cross-section area 'A' has resistance R. Another conductor of length '2l' and resistance 0.8 R.

Calculate area of cross section.

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Answer 1

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A cylindrical conductor of length I and uniform area of cross section A has resistance R.

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asked Jun 29, 2018 in Class X Science by aditya23 (-2,145 points)

A cylindrical conductor of length I and uniform area of cross section A has resistance R. Another conductor of length 21 and resistance R of the same material has area of cross section

A A2

B. 3A/2

C. 2A

D. ЗА

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answered Jun 29, 2018 by priya12 (-12,631 points)

C

Case 1: when length is I and Area of cross section is A



Case 2: when length is 21 and resistance is R and let area is A



As given in the question both conductors are of same material and has same area of cross-section, therefore, resistivity will be equal



And therefore, A=2A