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# Stack #39336

### Electrostatic/magnetic/dynamic formulas

What is the formula for the electrostatic force between 2 charges q1 and q2 separated by a distance r F = k(q1)(q2)/(r^2)
What is the formula for the force felt by a positive test charge (q) when brought into an electric field of strength E F = qE
What is the electric field (E) at a distance r away from a point charge Q? E = KQ/r^2
What is the formula for the electric potential (V) due to a source charge Q at a distance r from the source charge? V = KQ/r
What is the formula for the potential difference (V) in measuring the work done to move a charge q against an electric field? V = work/q
What is the formula for the electric potential energy between 2 charges q1 and q2, initially at an infinite distance apart, to a separation distance of r? U = K(q1)(q2)/r
The electric field (E) between 2 plates d units apart with a voltage (V) across the plates is? E = V/d
A parallel plate capacitor has a capacitance (C), expressed in terms of area (A) and distance apart (d) of? C = (permittivity)*A/d
The electric energy (U) stored in a capacitor is? U = 1/2 CV^2 or (1/2)QV
Capacitors in parallel? C = C1 + C2 + ...
Capacitors in series? 1/C = 1/C1 + 1/C2 + ...
How does the electric field and charge quantitiy change when a dielectric is added to a capacitor? E is decreased, but the amount of charge is increased.
The resistance (R) of a wire is dependent upon the resistivity (rho), the length (l) and the cross-sectional area (A) as? R = rho(l)/A
Ohm's Law V = IR
Resistors in series? R = R1 + R2 + ...
Resistors in parallel? 1/R = 1/R1 + 1/R2 + ...
Units of magnetic field? Tesla
How does B vary with current and the distance from the current-carrying wire? B=kI/r
Force on a length L of a current (I)-carrying wire in a magnetic field B? F = ILBsin(theta)
Force on a charged (q) particle moving with velocity (v) through a magnetic field (B)? F = qvBsin(theta)
Undeflected motion of a particle through a magnetic field? r = mv/qB
Lorentz force (sum of electric and magnetic forces)? qE = qvB or E=vB
Faraday's Law induced emf = change in flux/change in time
Magnetic flux = BA sin (theta) or Q(enclosed)/permittivity
Induced current (I) =-Blv/R
Intensity of a sound wave= power/area
Transformer rule Vp/Np=Vs/Ns or Power in primary side=Power in secondary side
Velocity of sound wave= freq * wavelength
Doppler Effect= app freq = freq (v + vo)/(v - vs)
Snell's Law n1*sin(theta1) = n2*sin(theta2)
Created by: mikeriddell