An unknown wire in a circuit has a circular cross-section with diameter 2.5 mm. It carries a current of…

Question:

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An unknown wire in a circuit has a circular cross-section with diameter 2.5 mm. It carries a current of &.7 mA.

Part (a) What is the current density, in milliamperes per square centimeter, in this wire?

Part (b) If you assume the drift velocity in this wire is 1 x 102 cm/s, what is the density of charge

carriers per cubic centimeter?

Part (c) If the conductivity in this wire is 2.5 x 106 2¹ m, what is the average time between collisions,

in nanoseconds?

Expert Answer:

Answer rating: 100% (QA)

Part a The current density J is defined as the current I per unit cross sectional area A In this case we need to find the current density in milliampe

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