The point charges Q and -2Q are placed at some distance apart. If the electric field at the location of Q is E, the . electric field at the location of -2Q will be

Also, electric field at the location of Q  E1=14πε0(-2Q)r2             it is due to -2Q  and towards -2Q or away from Q  Electric field at the location of 2Q it is due to Q and away from Q E2= 14πε0Qr2 E2 and E1 both are in the same direction. so E1E2 =2 E2=E2