Question: 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

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

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 2 m, what is the average time between collisions, in nanoseconds?

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Part a The current density J is defined as the current I per unit crosssectional area A In this case we need to find the current density in milliamper... View full answer

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