________ is a term used to describe a material's ability to retain magnetism. a) Coercive force b) Retentivity c) either "a" or "b" d) neither "a" nor "b" A coercive force is desirable in materials that is intended to be used as temporary magnets. a) low b) high c) extremely high d) any of the above A) Upon what does the electroniagnetic strength of an air-cored coil depend? a) number of turns in the coil b) amount of current flowing through the coil c) both "a" and "b" d) neither "a" nor "b"
.________ is a term used to describe a material's ability to retain magnetism.
a) Coercive force b) Retentivity c) either "a" or "b" d) neither "a" nor "b"
A coercive force is desirable in materials that is intended to be used as temporary magnets.
a) low b) high c) extremely high d) any of the above
A) Upon what does the electroniagnetic strength of an air-cored coil depend?
a) number of turns in the coil b) amount of current flowing through the coil c) both "a" and "b" d) neither "a" nor "b"
B) Upon what does the electromagnetic strength of an iron-cored coil depend?
a) amount of current flow b) number of turns c) permeability of the core d) all of the above
The left hand rule for a coil is such that if you were to hold a coil in your left hand with your fingers pointing in the direction of electron flow, your thumb would point in the direction of the
a) electron flow b) lines of flux c) north pole face d) none of the
above
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