electric fields Flashcards
equation for electric field strength (E) for a uniform electric field between two parallel plates? (V, d)
E = V/d
where V = pd between plates and d = distance separating plates
equation for electric potential (V) in radial field? (Q, r)
V = k(Q/r)
where k = coulomb’s law constant of proportionality, Q = charge and r = distance from charge
equation for electric field strength (E) in radial field? (Q, r)
E = kQ/(r^2)
where k = coulomb’s law constant, Q = charge and r = distance from charge
equation for coulomb’s law (aka electrical force (F))? (Q, q, r)
F = kQq/(r^2)
where k = coloumb’s law constant, Q = charge of one particle, q = charge of other particle and r = distance between [centre of] charges
equation for electric potential energy (electrical PE)? (Q, q, r)
electrical PE = kQq/r
where k = coloumb’s law constant, Q = charge of one particle, q = charge of other particle and r = distance between [centre of] charges
general equation for electric field strength (E)? (F, Q)
E = F/Q
where F = electrical force and Q = charge
equation for coulomb’s law constant of proportionality? (ε0)
k = 1/(4πε0)
where ε0 = permittivity of free space
general equation for electric force (F)? (E, Q)
F = EQ
equation for viscous drag force (stoke’s law)? (η, r, v)
F = 6πηrv
where η = viscocity of air, r = radius of droplet and v = velocity of droplet
equation for charge of droplet (Q) in milikan’s experiment? (m, g, d, V)
Q = mgd/V
where V = pd between plates
equation for total charge of group of charge carriers? (n, q)
Q = nq
where n = number of charge carriers, q = charge of each charge carrier
equation for KE gained by particle of charge Q when put in electric field with pd of V volts across it? (Q, V)
KE = QV
or
KE = qV
(just V = E/Q rearranged)
equation for size of magnetic force (F) exerted on charged particle cutting through magnetic field at right angles? (B, Q, v)
F = BQv
where B = magnetic flux density, Q = charge and v = velcoity of charged particle
equation for radius of circular path moved through by charged particle when charged particle is deflected by magnetic field?
r = mv/BQ
or
r = p/BQ
(just equate F = m(v^2)/r to F = BQv)
equation for frequency (f) that voltage across metal Ds of cyclotron alternates at?
f = Bq/(2πm)
