If a metal wire 4m long and cross-sectional are... - JAMB Physics 2014 Question
If a metal wire 4m long and cross-sectional area 0.8 mm2 has a resistance of 60, find the resistivity of the wire
A
5.3x10-7
B
3.0x10-5
C
1.2x10-6
D
3.2x10-6
correct option: c
(P = \frac{Ra}{L}\Omega m)
(P = \frac{6 \times 0.8}{4}\Omega m)
(P = 1.2 \times 10^{-6}\Omega m)
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