JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

Consider a wire of length

4 \mathrm{~m}

and cross-sectional area 1

\mathrm{mm}^2

carrying a current of

2 \mathrm{~A}

. If each cubic metre of the material contains

10^{29}

free electrons, find the average time taken by an electron to cross the length of the wire.

View answer and explanation

Correct option: B

3.2 \times 10^4\,\mathrm{sec}

Option B (

3.2 \times 10^4\,\mathrm{sec}

) is correct because it is calculated using the drift velocity formula and the relationship between drift velocity, length, and time.

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