79. The measure of a material\'s resistance to ma a. permeability b. reluctance

Question

79. The measure of a material's resistance to ma a. permeability b. reluctance c. saturation d. residual magnetism gnetism is 80. When a magnetic materials molecules are all lined wp, and increases in current flow no longer cause increasves in magnetic field strength, the material has reached b. reluctance c. saturation d. residual magnetisnm amount of magnetism left in a material after the magnetizing force has stopped is called a. permeability b. reluctance e. saturation d. residual magnetism 82. In the English system of measure, magnetic strength is measured in a term called a. residual magnetism b. reluctance c. permeability d. flux density In the English system, the total force producing a magnetic field is the a. magnetomotive force b. reluctance 83. c. permeability d. flux density 84. To locate the north pole of an electromagnet, use the hand rule. a. left b. right 85. were used in vacuum-tube circuits many years ago and are still used today in applications involving field-effect transistors (FETs) and multirange voltmeter circuits a. Voltage dividers b. Current dividers c. Voltage multipliers d. Current multipliers 86. Resistors that only have one ohmic value are called resistons a. fixed b. variable c. metal film d. composition 87. A resistor is made from a compound of carbon graphite and resin bonding material a. composition carbon b. metal film c. metal glaze d. wire-wound

Explanation / Answer

79. The measure of material's resistance to magnetism is reluctance. Itse somewhat analogus to electrical resisitance.

80. When the magetic field strenght does not change with increase in current then it has reached the saturation point.

81. The magnetism left in a material after the magnetising force is stopped is called residual magnetism.

82.Flux density is measured as magnetic field strength in English system.

83. Magnetomotive force(mmf) is the total force producing magnetic field.

84.The north pole of the electromagnet can be located using Fleming's left hand rule.

85.Voltage dividers were used in vaccum tube circuits and now used in FETs and in multirange voltmeter circuits.

86. Resistors have only one ohmic value are called fixed resistors. One ohmic value means they have a constant value, thus they have a fixed value.

87.Composition carbon resistors are made up carbon particles amd mixed with a binders.

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