Soft iron is suitable for making temporary magnets. True False

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Question
Soft iron is suitable for making temporary magnets.
Options
A. True
B. False

Correct Answer

True

Materials and Components problems

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4. 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 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. 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.

9. 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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