The area of cross-section of copper wire is 3 × 10-6 m2. It carries a current of 4.2 A. Calculate current density in the wire
1
1.4 × 106 A/m2
2
1.4 × 10-6 A/m2
3
1.4 × 106 C/m2
4
12.6 × 10-6 A/m2
The area of cross-section of copper wire is 3 × 10-6 m2. It carries a current of 4.2 A. Calculate current density in the wire