force_drift
- plasmapy.formulary.drifts.force_drift(F: Unit('N'), B: Unit('T'), q: Unit('C'))[source]
Calculate the general force drift for a particle in a magnetic field.
Aliases:
vfd_
- Parameters:
Examples
>>> import astropy.units as u >>> from astropy.constants.si import g0, e, m_e >>> ex = np.array([1, 0, 0]) >>> ez = np.array([0, 0, 1]) >>> force_drift(-ez*g0*m_e, ex*0.01*u.T, e) <Quantity [ 0.0000000e+00, -5.5756984e-09, 0.0000000e+00] m / s> >>> force_drift(-ez*g0*m_e, ez*0.01*u.T, e) <Quantity [ 0., -0., 0.] m / s> >>> force_drift(-ez*g0*m_e, ex*u.T, e) <Quantity [ 0.0000000e+00, -5.5756984e-11, 0.0000000e+00] m / s>
- Returns:
v – Drift velocity, in m/s
- Return type:
Notes
The particle drift in a magnetic field and with a general force (e.g. gravity) applied to it is given by
\[\vec{v} = \frac{\vec{F} \times \vec{B}}{q |B|^2}\]Note the charge dependency.