Question

is electric field neagtive due to a negative charge or due to its direction?

if we use a negative source charge then will its electric field be negative due to negative sign?

Answer 1

The electric field is a vector quantity, whose direction is described by the effect of a charge or set of charges on the region surrounding it. The electric field direction due to a positive charge is always directed away from the positive source and electric field direction due to a negative charge is always directed toward the negative source. Thus, if you use a negative source charge, then the electric field will be negative due to negative charge.