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Fields are quantities distributed through space where every WHAT has a WHAT
Fields are quantities distributed through space where every POINT has a DISTINCT VALUE
Temperature is a WHAT because temperature is fully described as a WHAT
Temperature is a VECTOR FIELD because temperature is fully described as a SINGLE QUANTITY
Wind is a WHAT because every point has two values: the wind WHAT and the wind WHAT
Wind is a VECTOR FIELD because every point has two values: the wind SPEED and the wind DIRECTION
Because fields are represented, mathematically they can be WHAT or WHAT together to give general views of the field
Because fields are represented, mathematically they can be ADDED or AVERAGED together to give general views of the field
In a magnetic field, iron filings act like WHAT because they follow the WHAT around the magnet
In a magnetic field, iron filings act like TEST PARTICLES because they follow the FIELD LINES around the magnet
We often represent fields as being flat objects spread out in space. However, a field occupies the WHAT all around it
We often represent fields as being flat objects spread out in space. However, a field occupies the SPACE all around it
Fields occupy space, WHAT, WHAT and WHAT
Fields occupy space, STORE and TRANSFER ENERGY and MOMENTUM
Charge is a quantity measured in WHAT, Charge can be WHAT or WHAT
Charge is a quantity measured in COULOMBS, Charge can be POSITIVE or NEGATIVE
What is a point charge
A point charge is a CHANGE that exists at a SINGLE POINT
ie) a change with very small area and volume
A charge (also called a WHAT) causes an WHAT to exist in the WHAT around it
A charge (also called a SOURCE CHARGE) causes an ELECTRIC FIELD to exist in the SPACE around it
The symbol for electric field is WHAT
E^>
Electric field is also a WHAT
Vector
We can represent the electric field by drawing field lines as WHAT surrounding the WHAT
We can represent the electric field by drawing field lines as ARROWS surrounding the CHARGE
Rule #1 is for finding the WHAT of an electric field created by a WHAT
Rule #1 is for finding the DIRECTION of an electric field created by a SOURCE CHARGE
What is rule #1
Electric field lines go AWAY from POSITIVE source charges and TOWARDS NEGATIVE source charges
What is rule #1 based on
Based in the direction that a POSITIVE test charge is pushed or pulled when placed in a source’s field
Test charges are always WHAT
POSITIVE
Electric force is the WHAT or WHAT a positive test charge in the same WHAT as the WHAT
Electric force is the PUSH or PULL a positive test charge in the same DIRECTION as the SOURCES ELECTRIC FIELD
The direction of the electric force on a WHAT charge is the same as the WHAT
The direction of the electric force on a POSITIVE TEST charge is the same as the SOURCE’S ELECTRIC FIELD DIRECTION
Charges don’t feel forces caused by their own WHAT, So although the test charges are making electric fields we don’t draw them
Assume the source charge is WHAT and the test charge can WHAT
Charges don’t feel forces caused by their own ELECTRIC FIELDS, So although the test charges are making electric fields we don’t draw them
Assume the source charge is FIXED IN PLACE and the test charge can MOVE
|E| = kq / r² which q is this
The charge from the SOURCE
and r = the distance form the source
|E| is directly proportional to what
1/r²
If r doubles then |E| becomes WHAT of its original size
1/4
Net electric field = WHAT
The SUM