Table 1: The gravitational force $F_{\rm g}$ and the Lorentz force $F_{\rm L}$ acting on a dust particle with a radius a have been compared under typical interplanetary conditions (at $1~ {\rm AU}$, solar wind with $v_{\rm sw} = 400 ~ {\rm km ~s^{-1}}$, magnetic field B = 5 nT, particles charged to $U = 10~ {\rm V}$; forces are given in Newton).

a ( ${\rm\mu m}$)		 $F_{\rm g}$ (${\rm N}$) $F_{\rm L}$ (${\rm N}$) ${F_{\rm L} \over F_{\rm g}}$

0.1		 $8.7 \times 10^{-20}$ $1.6 \times 10^{-19}$ 1.84
1 $8.7 \times 10^{-17}$ $1.6 \times 10^{-18}$ $1.84 \times 10^{-2}$
10 $8.7 \times 10^{-14}$ $1.6 \times 10^{-17}$ $1.84 \times 10^{-4}$
100 $8.7 \times 10^{-12}$ $1.6 \times 10^{-16}$ $1.84 \times 10^{-5}$


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