A metal has a large number of free electrons. If e is electronic charge and m is

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments

Question
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.

Correct Answer

Materials and Components problems

Search Results

1. 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 =

7. 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

10. For dielectrics in alternating field, polarizability a_e is a complex quantity. The imaginary part of a_e is zero for
Options
A. ? = 0
B. ? ? ?
C. ? = 0 and ? ? ?
D. ? = natural frequency ?₀

Comments

More in Electronics and Communication Engineering: