Electric Fields of Point Charge

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