A copper wire has diameter 1 mm and resistivity of 1.5 x 10-8 m. What will be the length of this wire to make its resistance 5 2? How much does the resistance change if the diameter is half?
Share
A copper wire has diameter 1 mm and resistivity of 1.5 x 10-8 m. What will be the length of this wire to make its resistance 5 2? How much does the resistance change if the diameter is half?
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
We have,
Now we know that, the formula for resistance is;
= R = ρ L/A
= 5 = 1.5 × 10-⁸ × L /πr²
= 5 × 10⁹/15 = L /3.14 × 10-³/2
= 10⁹/3 = L /1.57× 10-³
= 10⁹ × 157 × 10-² × 10-³/3
= 10⁹ × 157 × 10-⁵/3
= 52.3 × 10⁴ m
Therefore, the length of the conductor is 52.3 × 10⁴ m.
Now,if the diameter will be halfed then;
As, the length is reduced to half, thus the resistance will also be halfed.
__________________________
Thank youu!! :))
Answer:
neend nhi aa rahi
btw bruhh means .