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15 Cards in this Set
- Front
- Back
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Electric potential |
Electric potential, phi, is a physical quantity that defined the electrical potential energy per unit charger, and us calculated by phi=PE/Q |
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Phi for a point charge |
Phi = ke Q/r |
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Work done by electric field on a charge Q |
We= -Q Delta phi |
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Work done by a uniform electric field on a charge Q |
We= Q*Ex*Delta x |
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Motion of Charges Relative to their PE |
Charges move from higher PE to lower PE, regardless of charge |
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Motion of Charges relative to electric potential |
A positive charge released from rest moves from a higher potential to a lower potential A negative charge released at rest moves from lower potential to higher potential |
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Potential energy due to a pair of point charges |
PE = ke (Q1*Q2)/r |
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Work done by an agent to move a charge at constant speed in the electric field |
The work done by an agent to move charge at a constant speed is the negative of the work done by the electric field. Wagent = -We |
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Superposition principle of Electric Potential |
Electric potential due to a system of charges is the algebraic sum of electric potentials due to individual charges. Phinet = Phi1+Phi2+... |
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Energy Conservation Law |
In an isolated system of charges, the total mechanical energy is conserved. TEi = TEf KEi + PEi = KEf + PEf |
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Electric Flux |
The number of electric field lines is equal to the magnitude of the electric field times the surface area of plane. It is calculated by : phee = |E|A cos(theta) |
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Closed surface |
a surface that has an inside and outside, and it is impossible to get from outside to inside, and has a normal vector to a closed surface |
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Normal Vector |
n is perpendicular to the surface and points away from the surface |
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Flux (phee) thru a closed surface |
no charge, the phee = 0 if there is a charge Q, then phee = Q/epsilon not, epsilon not = 8.85e-12 C^2/Nm^2 |
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Gauss Law |
Phee through Gaussian surface with charge Q inside is Phee = Qinside/epsilon not |
