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41 Cards in this Set
- Front
- Back
Coulomb's Law states that the electrical force is proportionate to the ______ and inversely proportionate to the _______
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1)charge
2)square of the distance |
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-F( negative electric force) means
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There is attraction
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+F (positive electric force) means
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There is repulsion
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Electric force (formula) =
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Kxq1xq2 / r^2
*applies to point charges |
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Force experienced by a particle (formula) =
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qE
q (charge) E (electric field) |
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Electric Field (formula) =
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kxq/ r^2
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What is Electric Potential Energy?
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The stored energy a charge possesses with respect to position
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When a charge is move against the field......
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1) negative work is done
2)EPE increases |
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When a charge is moving with the field......
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1) positive work is done
2) EPE decreases |
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When charges are at infinity
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EPE is 0
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Electric potential is the....
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amount of EPE available at a certain point
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Electric Potential Formula
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V= K.Q/r
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When EP is negative.....
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No work is being done to move the charge
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The capacitance of a capacitor can be increased by......
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Moving the plates closer together
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Resistance depends on......
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1) Length
2) Cross Sectional Area (width) * directly prop to length * inv prop to width |
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The direction of the electric field is that of a
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+ charge
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Excess charge always resides on....
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The surface of a conductor because they are free to move and feel repulsive forces from each other
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When a particle passes through a both an Electric & Magnetic Field
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qE=vqB
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Ohm's Law
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V = I x R
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Power
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P = I x V
= I^2 X R = V^2 / R |
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Heat Dissapated
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H = I^2 x R X t
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Equivalent Resistance of Two Resistors in Series
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Rt= R1 + R2 + R3
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Equivalent Resistance of Two Resistors in Parallel
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1/Rt= 1/R1 + 1/R2 + 1/R3
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Equivalent Capacitance of Two Capacitors in Series
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1/Ct= 1/C1 + 1/C2
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Equivalent Capacitance of Two Capacitors in Parallel
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Ct= C1 + C2
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Magnetic Force on a Moving Charge
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F= qVB
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Radius of the Circle Described by a Charged Particle Moving Perpendicular to a Magnetic Field
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mv^2/r = vQB
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The X symbol for current traveling down a wire will cause the magnetic field to....
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rotate CLOCKWISE
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If a charged particle is negative the direction of the force vector would be.....
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Opposite to that predicted by the right hand rule
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When a charge moves parallel to the field...
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There is no force
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Magnetic force on current carrying wire
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F = BIL
I- current L- length B- magneitc field |
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How is Electrical Current induced?
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By moving a conductor through a magnetic field
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Magnetic flux formula
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Φ (phi)= B x A
B- mag field strength A- area |
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Three ways of changing magnetic fux
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1) Change Field Strength
2) Change Area 3) Change angle between area & mag field |
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Faraday's Law states?
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Induced EMF is a measure of the change in the magnetic flux over time.
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Flux can be changed by
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Changing the magnetic field direction
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Transformer
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Vs/ Vp = Ns/Np
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What happens to the electric field when a dielectric is inserted
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The electric field reduces
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Lenz's Law States
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The direction of the induced current is opposite to that of the source
E= - ΔΦ / Δt |
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What is Magnetic Flux?
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It is the strength of a magnetic field for a given area
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Once a conductor is moved through a mag field an emf is induced, only if there is a circuit the emf induces a........
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current
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