An electric field of 280000N/C points due south at a certain spot. what are the magnitude and direction of the force that acts on a charge of -4.0*10^-6C at this spot?
The Attempt at a Solution
I don't know how to get the direction, is it south? plz explain it...ty
And for question like this, what assumption would you make?, because i don't know the source charge is negative or positive