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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Easy

1 of 1

Application +4 | -1

An electron beam has an aperture

1.0 \mathrm{~mm}^2

. A total of

6 \times 10^{16}

electrons go through any perpendicular cross section per second. Find the current density in the beam. (in

\mathrm{A} / \mathrm{m}^2

)

View answer and explanation

Correct option: B

9.6 \times 10^3

Option B (

9.6 \times 10^3 \mathrm{A} / \mathrm{m}^2

) is correct because it is calculated by dividing the total current by the area of the aperture.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}