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MOTOR EFFECT
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Cards (18)
Produced by current in wire
Magnetic field
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Strength of magnetic field
Determines by current
magnitude
and
distance
from wire
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Solenoid
Coil of
wire
creating a strong
magnetic field
when current passes through
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Magnetic field in solenoid
Strong
and
uniform
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Electromagnet
Solenoid
with added
iron
core for increased magnetic field strength
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Motor effect
Force between
magnetic field
and current-carrying
conductor
in the field
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Fleming's Left-Hand Rule
Rule to determine
force direction
in motor effect
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Forefinger
in rule
Points in
direction
of magnetic field
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Second finger
in
rule
Points in direction of
current flow
in
conductor
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Factors affecting force on wire
Current
magnitude
and magnetic field
strength
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Force reversal in wire
Force direction
reverses
with current
direction
change
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Force increase in wire
Force strength
increases
with current strength
increase
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Criteria for force equation
Conductor must be at
right angles
to magnetic field
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Unit for magnetic flux density
Tesla
,
T
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Electric motor operation
Coil in magnetic field experiences
rotational
forces
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Loudspeakers use of motor effect
Convert current variations into
audible sound pressure
variations
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Loudspeaker
operation
Wire on
cone vibrates
in
magnetic field
, producing sound
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Pitch change in loudspeaker
Altering frequency of a.c current changes
cone vibration
frequency
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