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
Answers
Answered by
2
Answer:
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Answered by
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
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