WAEC - Physics (1988 - No. 43)
Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
0.0000267Ωcm
0.006Ωcm
0.26700Ωcm
0.27500Ωcm
0.060000Ωcm
Uitleg
R = αL/A
P = RA/L = (3 x 0.004)/2 = 0.006
P = RA/L = (3 x 0.004)/2 = 0.006