Question

If the resistance of a certain copper wire is 1Ω, then the resistance of a similar nichrome wire will be about:; A. 25 Ω; B. 30 Ω; C. 60 Ω; D. 45 Ω

Answer 1

Answer:

A. 25 (25 x 1)

Explanation:

25 times (25*1)

Answer 2

Explanation:

Given :

As we know that

R= ρ l/ A

Resistivity of copper = 1.7 x 10 ⁻⁸ Ω m

Resistivity of Nichrome =1.1 x 10⁻⁶ Ω m

Resistance of coppe wire = 1 ohm

R= ρ l/ A

R/ ρ  = l/A

l/A= 1/  1.7 x 10 ⁻⁸   =58.82x 10 ⁶

as option c is the nearest to resistivity so the answer is option c that is  60 ohm