A specimen of metal has n valence electrons per m3. If vx is the average velocit

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Question
A specimen of metal has n valence electrons per m³. If v_x is the average velocity of these electrons, each having a charge e, the current density J is
Options
A. J = ne v_x
B. J = - ne v_x
C. J =
D. J =

Correct Answer

J = - ne v_x

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5. A parallel plate capacitor has area of plate equal to 1 m and distance between plates is also 1 m². The lossy dielectric has a complex dielectric constant ?_r = ?'_r - j ?"_r. If the capacitor is represented by R and C is parallel, then
Options
A.
B.
C.
D.

6. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component v_x is x direction. Then
Options
A.
B.
C.
D.

8. The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about
Options
A. sign of charge carrier
B. density of charge carrier
C. both sign and density of charge carrier
D. none of the above

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