The electric field strength can be calculated... a. From the force on a charged

Question

The electric field strength can be calculated... a. From the force on a charged particle. b. From the voltage of a capacitor divided by the distance of the capacitor plates. c. From the cross product of speed and charge of a particle. d. From the force to a magnetic dipole. A magnetic field is generated... a. By an electric current. b. By a current through a coil. c. By a capacitor. d. By an eddy current. The magnetic permeability... a. Describes a materials property. b. Can be calculated by flux density "B" divided by magnetic field strength "H". c. Exists only for paramagnetic materials d. Describes the electric polarization. Magnetic particle techniques are sensitive to a. Inner defects of large steel objects b. Detect surface and surface near defects in mild steel c. Are very efficient for Al and Ti alloys d. Can detect defects under coatings For which of the following magnetic properties of materials the permeability is less than one or the susceptibility is less than zero? a. Diamagnetism b. Paramagnetism. c. Ferromagnetism. d. Flux density

Explanation / Answer

(b)From the voltage of the capacitor divided by the distance of the capacitor plate.

E = V/d

2)(a) By an electric current.

3)(c)Exists only for paramagnetic materials.

4)(d)Can detect defects under coatings

5)(a)Diamagnetism

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