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41 Cards in this Set
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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
