A wire of resistance x is doubled upon itself.Calculate the new resistance and resistivity
Answers
Answered by
3
Answer:
Explanation:
We consider wire is doubled on it means to fold the length of wire. It means its length will get half and area of cross section will get doubled.
∴ Let the resistance of the wire originally 'R' of length 'L' and area of cross-section 'A' with resistivity of material is 'p',
Then
R = p l/A = 4Ω
Now, for new arrangement,
p' = p
l' = l / 2
A' = 2A
Thus,
R' = p' l'/A' = p (l /2) ÷ 2A = !/4 (p l / A) = 1/4R = 1/4 × 4 = 1Ω.
Similar questions
Math,
5 months ago
Science,
5 months ago
Psychology,
5 months ago
Chemistry,
10 months ago
Biology,
10 months ago
Computer Science,
1 year ago
Hindi,
1 year ago
English,
1 year ago