Topic 2- Electricity Flashcards by Alice McLeod

same charges __ and opposite charges __

repel, attract

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how do charged objects attract neutral?

the charges inside the neutral object move relatively when near charged object

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can a neutral object attract a charged object?

yes

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when objects are rubbed together what happens to the charge?

the charge is exchanged

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charge in conductors:

move around

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charge in insulators:

builds up, no flow

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what does the ground do stop build-up of q?

accepts e’s

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an electroscope measures the

magnitude of q of an object

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if charges are free to move they will exert…

forces on each other and move until Fn on each q=0

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in electrostatic equilibrium excess q in a ___ is located __

conductor
at the surface of it

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coulomb law

Fe= k((q1q2)/r^2)

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coulomb law relationship between forces on 2 charges

F1on2=-F2on1

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electric field formula is k(Q/r^2)r what is the formula for the x component?

k(Qx/r^3)

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the electric field is a ___ and is true for

property of space altered by the presence of charge
positive charges in the field

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electrostatic force formula

F=qE

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for + EF lines point

away

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for - EF lines point

towards

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an electric dipole is a vector pointing from

negative q to positive q in a dipole

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electric dipole formula

p=qdi

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the force on a dipole is proportional to the

gradient of the electric field

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charge density 3D

charge per volume (C/m^3)

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charge density 2D

charge per area (C/m^2)

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charge density 1D

charge per length (C/m)

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dot product formula

multiple x components then add multiple y components then add the multiply of z components

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if vectors are perpendicular their dot product will be

work done is a l

line integral

work done formula

integral of: Fx ds(increment of the path)

what is a Gaussian surface?

a closed surface in 3D enclosing a volume

Gauss's Law for electricity

EA(flux)= qin(total q inside a Gaussian surface)/Eo

Magnetic flux

E (dot product) dA

magnetic flux if at angle

EAcos(angle)

magnetic flux for spherical

E x 4pir^2

magnetic flux: outside sphere

1/4pie0 x Q/r^2

magnetic flux: inside a hollow sphere

magnetic flux: inside solid sphere

1/4pie0 x q/R^3 x r if (r>R)

EF inside a conductor

electrostatic work formula

W=F x ds

the electrostatic force is/isn't conservative

when we say the electrostatic force is conservative what do we mean by conservative?

Wd by a force in a moving object from s1-s2 is independent of the path taken between 2 points

electrostatic potential energy graph the lines going upwards are from what charges?

2 negative

electrostatic potential energy graph the lines going downwards are from what charges?

negative and positive

as charges move closer together the electrostatic potential energy decreases/increases

decreases

electrostatic potential is also known as

voltage

electrostatic potential (V) formula

Ue/q (J/C=V)

change in an electrostatic potential relationship with electric field strength

V= -integral E (dot product) ds

what does the interaction of charged particles with a source charge?

an electric potential energy of a system of charges

what is the electric potential energy of a system of charges and units?

J it is work and is the work required to bring charges together

what is the electric potential of a system of charges and units?

V and it is the work per charge required to bring unit charge to a point in the electric field

is EPE or EP usually greater?

EPE

equipotential surfaces are

infinite parallel sheets

electric field lines are ___ to EPS

perpendicular

electric field lines point from low to high or high to low electric potential (V)

high to low (downhill)

if it is a negative charge (and on EPS) it will be at a region of what potential?

low

capacitors are

2 conducting plates separated by a vacuum

net charge of capacitors is

capacitance unit

Farrad

capacitance 2 formulas

Q/V or e0A/d

charge on a capacitator

Q=CE

capacitors in parallel

C=C1+C2....

capacitors in series

1/C= 1/C1+ 1/C2...

batteries are a collection of

cells tat maintain potential difference through chemical reactions

dielectrics are

an insulator that can support an induced Efield

current flows from

+ to -

current is scalar?

yes

in current electrons move which way and why?

opposite direction to I due to the electric field in conducting wire

current density vector points in what direction to EF

same

resistance is a measure of an objects ability to

resist an electric I

resistance in series vs parallel

series: R=R1+R2... parallel: 1/R=1/R1+1/R2

is resistance greater in a short thick wire or long thin

long thin

does ohms law hold for all conductors?

the gradient of a graph of I by V is

the conductance

series circuit VIRC:

voltage= V1+V2 current= I1=I2 resistance= R1+R2+R3 capacitance= 1/C=1/C1+1/C2

parallel circuit VIRC:

voltage= V1=V2 current= I=I1+I2 resistance= 1/R=1/R1+1/R2+1/R3 capacitance=C=C1+C2+C3..

Kirchhoff's loop law states the

delta-V in a circuit is 0 ( for a conservative Ef) and non-conservative is delta mag flux

Topic 2- Electricity Flashcards

(74 cards)