A piece of graphite has a cross-sectional area of 10mm2. If its resistance is 0.1Ω and its resistivity 10×108 Ωm, its length is:
A. 10 m
B. 10 cm
C. 10 mm
D. 10 km
Answer:A
A piece of graphite has a cross-sectional area of 10mm2. If its resistance is 0.1Ω and its resistivity 10×108 Ωm, its length is:
A. 10 m B. 10 cm C. 10 mm D. 10 km