Question

Problem 3. Find the resistance of 1000 metres of
copper mire 25 sq.men in cross-section Comment on
the resistance of another wire of the same material,
three times long
and one half the cross-sectional
area​

Answer 1

Answer:

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Answer 2

Explanation:

We know,

R = pl / A

for, 1 = 1 m and A = 1 sq.mm, R = 1 / 58 ohm

1' = 1000 and A' = 25sq.mm = 25A

R = p×1000 / 25 A

= 1 / 58 × (1000/25)

= 20/29 ohm