a wire of uniform cross section having a resistance of 4 ohm is stretched to 3 times its original by what factor does the resistance change?
Answers
Answered by
2
Answer:
Explanation:
As a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because its cross sectional area decreases.
Tripling the length will triple the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in three times the length. So, the resistance is actually higher than 3x.
You need to look at Poisson’s ratio, and consider R = pl/A. What metal is the conductor made from?
Answered by
1
Answer:
36 ohm
volume = length x area
by considering this , if length increases then area decreases . Since it has uniform cross section .
Attachments:
Similar questions