Aπ_ ("pi-minus") particle, which has charge -e, is at location ‹ 6.00 10-9, -2.00 10-9, -3.00 10-9 › m. what is the electric field at location < -5.00 10-9, 5.00 10-9, 4.00 10-9 > m, due to the π_ particle? an antiproton (same mass as the proton, charge -e) is at the observation location. what is the force on the antiproton, due to the π-? expert answer