Magnets
WHERE ARE MAGNETS THE STRONGEST?
THE POLES
WHAT ARE THREE WAYS TO MAKE AN ELECTROMAGENT STRONGER?
ADD MORE LOOPS IN THE SOLENOID
ADD MORE VOLTAGE
ADD IRON CORE
A MOTOR TRANSFERS WHAT TYPE OF ENERGY?
A MOTOR TRANSFERS ELECTRICAL ENERGY INTO MECHANICAL ENERGY.
WHAT CREATES AN ELECTRIC FIELD?
MOVING ELECTRIC CHARGES.
FROM THE GEOMETRY LAB OF MAGNETISM...WHAT TWO PROPERTIES DOES A MAGNETIC FIELD ASSIGN TO EVERY POINT IN SPACE?
DIRECTION AND STRENGTH(MAGNITUDE)
HOW DO TWO LIKE POLES INTERACT WITH EACH OTHER?
LIKE POLES REPEL
EITHER POSITIVE-POSITIVE OR NEGATIVE-NEGATIVE
WHAT ARE THE THREE THINGS NEEDED FOR AN ELECTROMAGNET?
IRON CORE, LOOPS OF WIRE(SOLENOID), BATTERY(VOLTAGE)
WHAT TYPE OF ENERGY TRANSFER DOES A GENERATOR GO THROUGH?
A GENERATOR TRANSFERS MECHANICAL ENERGY TO ELECTRICAL ENERGY.
HOW IS A MAGNETIC FIELD INDUCED?
A MOVING ELECTRIC FIELD CREATES A MAGNETIC FIELD.
FROM THE APPLYING THE LANGUAGE OF FIELDS WE INVESTIGATED VERY BRIEFLY ABOUT THE IDEA OF 3D VECTORS USING THE RIGHT HAND RULE.
WHAT DOES THE RIGHT HAND RULE TELL ME ABOUT A CURRENT CARRYING WIRE?
WHAT IS THE MAIN DIFFERENCE BETWEEN A BAR MAGNET AND AN ELECTROMAGNET?
A BAR MAGNET IS A PERMAMENT MAGNET WHERE AN ELECTROMAGNET IS A TEMPORARY MAGNET.
HOW COULD YOU CHANGE THE POLES OF AN ELECTROMAGNET?
CHANGE THE DIRECTION OF CURRENT.
WHAT IS THE CORRECT ORDER OF ENERGY TRANSFER THROUGH THE PARTS OF A MOTOR?
BATTERY - ARMETURE/COIL - MAGNET - MECHANCIAL ENERGY BY ROTATION
THE SPEED YOU MOVE THE BAR MAGNET WILL BE PORPORTIONAL TO THE MAGNETIC STRENGTH.
MAGNETIC FIELD LINES HAVE NO BEGINNING AND NO END. THIS IS THE FIRST MAXWELL EQUATION THAT WE LOOKED AT.
IT SAYS THE DIVERGENCE OF THE MAGNETIC FIELD IS EQUAL TO ZERO?
WHAT DOES THIS TELL YOU ABOUT ISOLATING A SINGLE POLE OF A MAGNET?
ITS IMPOSSIBLE - MAGNETIC FIELD LINES FORM CLOSED LOOPS THAT HAVE NO START AND NO END. TO SEPERATE THIS WOULD BE LIKE DIVIDING INFINITY, WHICH STILL LEAVES ME WITH INFINITY.
WHAT ARE MAGNETIC DOMAINS? HOW DO YOU KNOW IF IT IS "MAGNETIZED"?
MAGNETIC DOMAINS ARE MAGNETICALLY ALIGNED ATOMS. IF ALL THE ARROWS POINT IN THE SAME DIRECTION THE OBJECT IS MAGNETIZED.
WHY IS THERE A MAGNETIC FIELD AROUND AN ELECTROMAGNET?
MAGNETIC FIELDS ARE CREATED BY MOVING ELECTRIC CHARGES. SINCE THERE IS A CURRENT IN THE SOLENOID WRAPPED AROUND THE IRON CORE THERE IS AN INDUCED MAGNETIC FIELD.
LOOKING AN IMAGE OF A MOTOR AND A GENERATOR... HOW DO YOU DETERMINE WHICH IS THE MOTOR AND WHICH IS THE GENERATOR?
THE GENERATOR SHOULD HAVE SOME SORT OF CRANK TO TURN MECHANICAL TO ELECTRICAL ENERGY.
THE PROCESS OF GENERATING A CURRENT IN A CIRCUIT BY MOVING A WIRE THROUGH A MAGNETIC FIELD IS CALLED?
ELECTROMAGNETIC INDUCTION.
WHAT CONDITION IS NECASARRY TO INDUCE A VOLTAGE IN COIL - AND WHAT CONDITION IS NOT SUFFICENT ON ITS OWN?
WHEN THE CONDITION IS NOT MET...WHAT PHYSICAL QUANTITY SHOWS ME?
THE MAGNET MUST BE MOVING/CHANGING WITHIN THE COIL OF WIRE. A STATIONARY MAGNETIC FIELD DOES INDUCE AN ELECTRIC FIELD ALONE BUT IT MUST BE MOVING RELATIVE TO THE FIELD.
STATIONARY MAGNET=NO VOLTAGE
THE NORTH SIDE IS ATTRACTED TO MAGNETIC SOUTH AND THE SOUTH SIDE IS ATTRACTED TO MAGNETIC NORTH.
HOW WOULD YOU MAKE AN ELECTROMAGNET.
WRAP COILS AROUND AN IRON CORE. CONNECT IT TO A BATTERY. THE MORE COILS THE GREATE THE MAGNETIC STRENGTH OF THE ELECTROMAGNET.
WHAT ARE THE COMPONENTS THAT ARE FOUND IN BOTH DC MOTORS AND GENERATORS?
BOTH MOTORS AND GENERATORS SHOULD HAVE A COIL OF WIRE, A MAGNET, AND A ROTATING ARMETURE. THE DIFFERENCE IS JUST JUST THE DIRECTION OF ENERGY TRANSFER.
A BATTERY WILL ONLY BE FOUND IN MOTORS. NOT GENERATORS.
IF THE NUMBER OF COILS IN A SOLENOID IS DOUBLED, WHAT HAPPENS TO THE VOLTAGE AND CURRENT?
VOLTAGE SHOULD INCREASE PROPORTIONALLY BY DOUBLING AND LIKEWISE, BECAUSE OF OHM'S LAW, WE SHOULD ALSO SEE THE CURRENT INCREASE PORPORTIONALLY BY DOUBLE AS WELL.
FORCES ARE NOT APPROPRIATE WHEN THINKING ABOUT ACTIONS AT A DISTANCE AND NEWTON WAS TROUBLED BY THIS...
THROUGH THE YEARS WE HAVE DEVELOPED A BETTER FORMALISM TO ADDRESS THIS IDEA. WHAT IS IT AND HOW DOES IT RESOLVE THE FORCE AT A DISTANCE PROBLEM?
I AM LOOKING FOR AN IDEA THAT STILL ALLOWS FORCES BUT ONLY WHEN CERTAIN CONDITIONS ARE MET. GIVE ME AN EXAMPLE OF HOW YOU KNOW.
FORCE IS INTERACTION
FIELD IS STRUCTURE
WHEN MATTER MEETS THE REQUIREMENTS FOR INTERACTION INSIDE OF A FIELD, THIS WILL BE A FORCE ON THAT MATTER.
EXAMPLES: MASS AND GRAVITY FIELDS
CHARGE AND ELECTRIC FIELDS
MAGNETIC OBJECTS AND MAGNETIC FIELD
NO FORCE HAPPENS WHEN THE MATTER DOES NOT MEET THE REQUIREMENT OF THE FIELD. MASS AND ELECTRIC FIELDS DO NOT PRODUCE FORCE.