A positive point charge +Q is kept in a uniform electric field directed to the right (+x-axis). Along which of the following directions can a point be found where the magnitude of the net field becomes zero?
a) Somewhere to the right of the charge on the +x-axis
b) Nowhere in space; the fields can never cancel
c) Somewhere to the left of the charge on the −x-axis
d) Directly above the charge on the +y-axis