Question

Define these terms

Electron Mobility

Current Density ​

Answer 1

Answer:

electron mobility-the electron mobility characterises how quickly an electron can move through a metal or semiconductor, when pulled by an electric field. There is an analogous quantity for holes, called hole mobility.

current density-current density is the amount of charge per unit time that flows through a unit area of a chosen cross section.

Answer 2

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➭${{{\bold{Electron\: Mobility}}}}$ (u): It is defined as the magnitude of the drift velocity to the electric field .

→ u = Vd/E

→ u =[ e.E/m ] × Torque × 1/E

•°• u = e.T/m

Where T is Torque acting on the body.

Units : $\frac{m}{s.C.N}$

➭${{{\bold{Current \: Density }}}}$ (J) : It is defined as the current passing per area.

J = $\frac{I}{A}$

Units : A/m²

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