An electromagnetic field exists only when there is
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
When a solenoid is activated, the force that moves the plunger is
The direction of a magnetic field within a magnet is
A basic one-loop dc generator is rotated atrev/s. How many times each second does the dc output voltage peak (reach maximum)?
The unit for reluctance is
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
When the north poles of two bar magnets are brought close together, there will be
The unit for permeability is
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
The ability of a material to remain magnetized after removal of the magnetizing force is known as
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
The induced voltage across a stationary conductor in a stationary magnetic field is
The induced voltage across a coil withturns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
For a given wirewound core, an increase in current through the coil
Electromagnetic induction is the force that produces a magnetic field.
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
Lenz's law defines the polarity of the induced voltage.
The tesla is the unit of magnetic flux.
Ampere-turn is the unit of magnetomotive force (mmf).
When the current through the coil of an electromagnet reverses, the
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