For ohmic substance, the electron drift velocity is proportional to:
Correct answer: D. The electric field in the sample
- A. Cross sectional of the sample
- B. The length of sample
- C. The mass of an electron
- D. The electric field in the sample
Explanation
Drift velocity is proportional to current. In a resistive material, it is also proportional to the magnitude of an external electric field. Thus Ohm's law can be explained in terms of drift velocity.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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