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3 cards from this section. Quick, good the night before a test.
What is mobility?
Think about how charge carriers behave when an electric field is applied.
What units are used for mobility?
Consider the relationship between drift velocity and electric field.
What does mobility measure?
Consider the definition of mobility.
The unit of mobility is?
Think about how mobility is expressed in calculations.
A copper wire has a cross-sectional area of 1 mm² carrying a current of 3 A. Assuming the density of free electrons is 8.5 x 10²⁸ m⁻³, find the drift velocity and mobility if the electric field is maintained at 1000 V/m.
Use the relationship I = nAev_d for calculating drift velocity.
A silicon device has a mobility of 1200 cm²/Vs and operates under an electric field of 500 V/m. What is the drift velocity? How does this affect its performance in electronic devices?
Convert mobility to m²/Vs before calculating drift velocity.
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