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What is mobility?

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What is mobility?

(a) Ease of carrier drift

(b) Ease of current flow

(c) Ease of access to the junction

(d) Ease of movement

This question was posed to me during an online interview.

This key question is from Drift and Diffusion Current in chapter Diode Circuit of Analog Circuits

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Right answer is (a) Ease of carrier drift

Easiest explanation: Mobility is the ease with which carriers can drift. The higher the collision time, the greater is the mobility also the lighter is the carrier, the greater is its mobility. Thus on the application of an electric field it’s easier for carriers to drift.

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