chap 3 electromagnetism
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ELECTROMAGNETISM
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DDEVICE IN WHICH MAGNETISM
IS PRODUCEDBY AN ELECTRIC CURRENT
TEMPORARYMAGNETIC
FIELD
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O
P
E
R
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B
O CIRCUIT IS SWITCH ON
P
R
E1
SOFT-IRON IN THESOLENOID BECOMEELECTROMAGNET
ATTRACTS THE SOFT-IRONARMATURE
E2 ATTRACTS THE SOFT-IRONARMATURE
STARTER MOTOR IS
SWITCHED ON
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O
P
E1
E2
VARYING CURRENT PASSTHROUGH THE COIL
B
SOFT IRON BECOMES AN
ELECTROMAGNET WITHVARYING MAGNETIC
FIELD
ELECTROMAGNET
ATTRACTSTHE DIAPHRAGM
DIAPHRAGM VIBRATES ATA FREQUENCY SAME AS
FREQUENCY OF THE
VARYING CURRENT
E2 SOUND WAVE PRODUCE
CONVERTS VARYINGELECTRIC
CURRENTS TOSOUND WAVE
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O
P1
E1
E2
P2
CIRCUIT IS SWITCH ON
SOFT-IRON IN THESOLENOID BECOMEELECTROMAGNET
ATTRACTS THE IRONARMATURE
HAMMER HIT THE BELL
THE MOVEMENT OF THEARMATURE BREAKS
THE CIRCUIT
IRON CORE LOSES ITSMAGNETISME3
R
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SUDDEN SURGE IN THE
CURRENT
IRON IN THESOLENOID BECOMEELECTROMAGNET
IRON BAR IS ATTRACTEDTO ELECTROMAGNET
CIRCUIT BREAKS
O
P
R
E
B
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KONDUKTORPEMBAWA ARUS DLM
MEDAN MAGNET
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FORCE (F)
MAGNETICFIELD (M)
CURRENT (C)
F = FARID
M = MAKANC = COK KODOK
FLEMINGS LEFT-HAND RULE
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O = COOPER ROD
C M
F
K = SWITCH IS PRESSED
A = CURRENT FLOWSTHROUGH
THE COOPER ROD
HA = MOVES TO THERIGHT
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O = COOPER ROD
C M
F
MOVES
K = SWITCH IS PRESSEDA = CURRENT FLOWS
THROUGHTHE COOPER ROD HA = MOVES TO THE
LEFT
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O = COOPER ROD
P= MAGNETIC FIELD OFPERMANENT MAGNETINTERACT MAGNETIC FIELDOF CURRENT-CARRYING
COOPER ROD
E = GIVES RISE TO ANELASTIC MAGNETIC
FIELD
R = ROD MOVES
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O = COOPER ROD
K= MAGNETIC FIELD OFPERMANENT MAGNETINTERACT MAGNETIC FIELDOF CURRENT-CARRYING
COOPER ROD
A = GIVES RISE TO ANELASTIC MAGNETIC
FIELD
HA = ROD MOVES
XMOVE
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DIRECT CURRENTMOTOR
COIL ABCDAT HORIZONTAL
POSITION
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O COIL A B
K1 THE CURRENTFLOWS FROMA TO B
A1 FORCEACTING ONTHE WIRECOIL AB
MOVESDOWNWARDS
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O COIL CD
K2
THE CURRENTFLOWS FROMC TO D
A2 FORCEACTINGON THE WIRECOIL CDMOVESUPWARDS
F
HA COIL ABCDAT VERTICALPOSITION
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O COIL ABCD AT VERTICALPOSITION
K CARBON BRUSH DIDNTTOUCH THE SPACE BETWEENHALVES OF COMMUTATOR
A CUTTING OFF THECURRENT
HA COIL ABCDAT VERTICALPOSITION
HA CONTINUEROTATE BECAUSE OF
INERTIA
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C
D
A
B
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O
P
E
R1
R2
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O
P
E
MAGNET
PUSH INTOSOLENOID
MAGNETIC FLUXOF MAGNET IS CUT
RINDUCED CURRENT
PRODUCED
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O
P
E
MAGNET
STATIONARY
INSIDESOLENOID
NO MAGNETIC FLUXOF MAGNET IS CUT
RNO INDUCEDCURRENTPRODUCED
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O
P
E
MAGNET
PULL OUT OF THESOLENOID
MAGNETIC FLUX
OF MAGNET IS CUT
RINDUCED CURRENTFLOWS IN OPPOSITE
DIRECTION
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O
P
ER
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Ns
Np
NUMBEROF TURNS INSECONDARY
NUMBEROF TURNS INPRIMARY
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