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.
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Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
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