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CBSE Class 10 Answered

Resistance of a metal wire of length 1m is 26 ohm at 20 degree C. If the diameter of the wire is 0.3mm, what will be the resisivity of the metal at that temperature?
Asked by Annababu000 | 08 Feb, 2020, 03:42: PM
answered-by-expert Expert Answer
Resistance R of a conductor is given as
 
R = ρ × ( L/A)    or   ρ = R × (A/L)   ..................(1)
 
where ρ is resistivity of material , L is length and A is area of cross section
 
ρ = 26 × (π/4) × (0.3)2 × 10-6 = 1.838 × 10-6 ohm-m
Answered by Thiyagarajan K | 08 Feb, 2020, 05:56: PM

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