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Materials and Components problems

1. An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ?. The orbital magnetic dipole moment is
Options
A. 0.5 e? R²
B. e? R²
C. 2 e? R²
D. 0.5 e? R³

3. A circular sphere mile is the area of cross-section of a wire
Options
A. having a diameter equal to 1 miles
B. having a radius equal to 1 miles
C. having a circumference equal to 1 miles
D. none of the above

6. In its lowest state, the electron is bound to the field of proton by an energy equal to
Options
A. 100.5 eV
B. 51.2 eV
C. 13.6 eV
D. 0.2 eV

8. In a ferromagnetic material, the internal field seen by a dipole is
Options
A. equal to applied field
B. equal to applied field minus a contribution from neighbouring dipoles
C. equal to applied field plus a contribution from neighbouring dipoles
D. equal to or less than applied field

10. The law that (where K is thermal conductivity, ? is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as
Options
A. Lorentz law
B. Wiedemann Franz law
C. Curie Weiss law
D. Kittel law

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