When 115 V is applied across a wire of length 10m and radius 0.3 mm, the current density is 1.4 x 104 A m2. The resistivity of the wire is:
A. 4.1 × 104 Ωm
B. 8.2 × 10-4 Ωm
C. 16.4 × 104 Ωm
D. 2.1 × 104 Ωm
Answer:B
When 115 V is applied across a wire of length 10m and radius 0.3 mm, the current density is 1.4 x 104 A m2. The resistivity of the wire is:
A. 4.1 × 104 Ωm B. 8.2 × 10-4 Ωm C. 16.4 × 104 Ωm D. 2.1 × 104 Ωm