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# phyx eqns E & M

Electric Field (two) E = F / q or E = k Q / r^2 q= point charge
Electric Potential Energy U = q V or W = q V V= Electric Potential
Average Electric Field E = -V/r
Capacitance C = Q/V Q= Charge
Capacitance with Area C = εo A/ r εo = vacuum permittivity constant
Electric Potential V = k Q / r
Electric Charge Q= CV
Energy Stored in a Capacitor (two) U = 1/2 QV or U = 1/2 CV^2
Resistance R = pl/ A p= resistivity l= length A= Area
Ohm's Law V= IR
Electric Power P = IV
Total Capacitance in Parallel Ct = C1 + C2 + C3
Total Capacitance in Series 1/Ct = 1/C1 + 1/C2 + 1/C3
Total Resistance in Series Rt = R1 + R2 + R3
Total Resistance in Parallel 1/ Rt = 1/R1 + 1/R2 + 1/R3
Force from a Magnetic Field on a moving charge FB = q v B sin θ When the angle is 90 the F is at its max. When it is parallel there is not force
Force from a Magnetic Field from a current in a wire FB = B I l sin θ
Magnetic Field from a current in a wire or Ampere's Law B = μo I / 2πr
Magnetic Flux φ = BA cos θ
Average Induced EMF € = - N Δφ / Δt N = Number of Loops
Induced EMF in a moving conductor € = B l v
Right Hand Rule for Force Fingers- B Thumb- v Palm - F
Right Hand Rule for Current Place thumb in direction of the current. Curve fingers point in the direction of the magnetic field.
Force of a charge moving in a curved path (three) F = mac = qvB = mv^2/r
Kirchoff's Junction Rule The sum of all currents entering a junction is the equal to the sum of all currents leaving that junction.
Kirchoff's Loop Rule The sum of the voltage changes around any closed pat of the circuit must be zero.
Magnetic Field inside a Solenoid B = μo n I μo = Vacuum Permeability Only if air is in the solenoid, if there is something else use μ which is magnetic permeability n= number of loops per unit length I = Current
Created by: cstephens125

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