Question

A cylindrical conductor of length T and uniform area of cross section 'A
has resistance 'R'. The area of cross section of another conductor of same
material and same resistance but of length 2 is
(b)
3A
(c)2A
(d) 3A​

Answer 1

Answer:

2A is the correct answer

Answer 2

Answer:

C) 2A is the answer

Explanation:

Let area of cross section of other conductor be a'

If we take resistance of both conductors same,

R= ρl/a      i)

R= ρ2l/a'     ii)

From i) and ii), we get,

ρl/a= ρ2l/a'

⇒1/a = 2/a'

∴a'= 2a

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