Electric Fields Flashcards
1
Q
electric field
A
a charge produces an electric field; another charge experiences the electric force exerted by the field
2
Q
in an electric field, if the test charge is positive…
A
the electric field and force have the same direction
3
Q
in an electric field, if the test charge is negative…
A
the electric field and force have opposite directions
4
Q
field lines extend away from
A
positive charges
5
Q
field lines extend towards
A
negative charges
6
Q
direction of electric field
A
tangent to the electric field line
7
Q
magnitude of EF is
A
proportional to the density of electric field lines
8
Q
EF due to point charge
A
doesn’t depend on test charge
9
Q
EF points away from q if
A
q is positive
10
Q
EF points towards from q if
A
q is negative
11
Q
magnitude of dipole (p)
A
qd
12
Q
Continuous charge distributions
A
- Divide charge distribution into small pieces
- Treat each piece as a point charge and calculate E due to dq
- add all contributions of pieces towards E
