Study your flashcards anywhere!
Download the official Cram app for free >
 Shuffle Toggle OnToggle Off
 Alphabetize Toggle OnToggle Off
 Front First Toggle OnToggle Off
 Both Sides Toggle OnToggle Off
 Read Toggle OnToggle Off
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
41 Cards in this Set
 Front
 Back
Coulomb's Law states that the electrical force is proportionate to the ______ and inversely proportionate to the _______

1)charge
2)square of the distance 

F( negative electric force) means

There is attraction


+F (positive electric force) means

There is repulsion


Electric force (formula) =

Kxq1xq2 / r^2
*applies to point charges 

Force experienced by a particle (formula) =

qE
q (charge) E (electric field) 

Electric Field (formula) =

kxq/ r^2


What is Electric Potential Energy?

The stored energy a charge possesses with respect to position


When a charge is move against the field......

1) negative work is done
2)EPE increases 

When a charge is moving with the field......

1) positive work is done
2) EPE decreases 

When charges are at infinity

EPE is 0


Electric potential is the....

amount of EPE available at a certain point


Electric Potential Formula

V= K.Q/r


When EP is negative.....

No work is being done to move the charge


The capacitance of a capacitor can be increased by......

Moving the plates closer together


Resistance depends on......

1) Length
2) Cross Sectional Area (width) * directly prop to length * inv prop to width 

The direction of the electric field is that of a

+ charge


Excess charge always resides on....

The surface of a conductor because they are free to move and feel repulsive forces from each other


When a particle passes through a both an Electric & Magnetic Field

qE=vqB


Ohm's Law

V = I x R


Power

P = I x V
= I^2 X R = V^2 / R 

Heat Dissapated

H = I^2 x R X t


Equivalent Resistance of Two Resistors in Series

Rt= R1 + R2 + R3


Equivalent Resistance of Two Resistors in Parallel

1/Rt= 1/R1 + 1/R2 + 1/R3


Equivalent Capacitance of Two Capacitors in Series

1/Ct= 1/C1 + 1/C2


Equivalent Capacitance of Two Capacitors in Parallel

Ct= C1 + C2


Magnetic Force on a Moving Charge

F= qVB


Radius of the Circle Described by a Charged Particle Moving Perpendicular to a Magnetic Field

mv^2/r = vQB


The X symbol for current traveling down a wire will cause the magnetic field to....

rotate CLOCKWISE


If a charged particle is negative the direction of the force vector would be.....

Opposite to that predicted by the right hand rule


When a charge moves parallel to the field...

There is no force


Magnetic force on current carrying wire

F = BIL
I current L length B magneitc field 

How is Electrical Current induced?

By moving a conductor through a magnetic field


Magnetic flux formula

Φ (phi)= B x A
B mag field strength A area 

Three ways of changing magnetic fux

1) Change Field Strength
2) Change Area 3) Change angle between area & mag field 

Faraday's Law states?

Induced EMF is a measure of the change in the magnetic flux over time.


Flux can be changed by

Changing the magnetic field direction


Transformer

Vs/ Vp = Ns/Np


What happens to the electric field when a dielectric is inserted

The electric field reduces


Lenz's Law States

The direction of the induced current is opposite to that of the source
E=  ΔΦ / Δt 

What is Magnetic Flux?

It is the strength of a magnetic field for a given area


Once a conductor is moved through a mag field an emf is induced, only if there is a circuit the emf induces a........

current
