Question

.The resistance of a metal wire of length 1m is 25 Ω at 20 ᵒ C. If the diameter of the wire is 0.3 mm, What must be the resistivity of metal at that temperature? ​

Answer 1

Answer:

Given: R=26 Ω, l=1m, d=0.3mm

Step 1: Resistivity of the metal (ρ)

We know that resistance can be given as :

R= A

ρ l

⇒ρ= R A

....(1)