How use velocity vector in field definition

Dear All,

I want to use velocity vectors as a variable component in electric field definition, something like this :

fix 3 all efield v_vx 0.0 0.0

Should I use any specific command, what it should be.

Any help would be highly appreciated,

Regards,
SMM1370
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Not sure what you are asking. The doc page for the fix efield
and variable commands give lots of details on this.

Steve