An unknown wire in a circuit has a circular cross-section with diameter 4.8 mm. It carries a current of 2.1 mA. A. What is the current density, in milliamperes per square centimeter, in this wire? B. If you assume the drift velocity in this wire is 1 × 10-2 cm/s, what is the density of charge carries per cubic centimeter? C. If the conductivity in this wire is 3.5 × 106 Ω-1 m-1, what is the average time between collisions, in nanoseconds

An unknown wire in a circuit has a circular cross-section with diameter 4.8 mm. It carries a current of 2.1 mA. A. What is the current density, in milliamperes per square centimeter, in this wire? B. If you assume the drift velocity in this wire is 1 × 10-2 cm/s, what is the density of charge carries per cubic centimeter? C. If the conductivity in this wire is 3.5 × 106 Ω-1 m-1, what is the average time between collisions, in nanoseconds