The electric field at a point in space is E = (600i +100j) N/C .?

Question

What is the x-component of the electric force on a proton at this point?

What is the x-component of the electric force on an electron at this point?

Answer 1

depending on whether x is lined up with i or j (or somewhere in bewteen - how would I know?) you multiply by charge on proton to get newtons, reverse sign to get force on electron