CBSE Class 10 Answered
Resistance of a metal wire of length 2m is 30 ohm at temp. 25°C. If the diameter of wire is 0.6 mm what will be the resistivity of metal at that temp ?
Asked by Saniiyashaikh | 10 Mar, 2019, 01:19: AM
Expert Answer
Resistance R = ρ×(L/A) , where ρ is resistivity, L is legth of wire and A is area of cross section
hence resitivity ρ = R×(A/L) = 30 × ( π×0.3×0.3×10-6)/2 = 4.24×10-6 ohm-m
Answered by Thiyagarajan K | 10 Mar, 2019, 02:37: PM
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