1. 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
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A

Question

1.	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
(a)	A/2
(b)	3A/2
(c)	2A
(d)	3A

Accepted Answer

Soln:
Answer is (c) 2A
Explanation:
P=𝑅𝐴
𝑙
When Length doubles
P=𝑅𝐴
2𝑙
𝑅𝐴=𝑅𝐴
𝑙 2𝑙
A=2A

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