A charge of -16 x 10 ^-6 C , Q1, is fixed on x axis at 4 m and a charge of + 9x 10^-6, Q2, is fixed at +3 m on y axis Show E1 and E2 vector due to each charge.
Calculate electric potential V at origin.
A charge Q3= -4 x 10^-6 C is brought from distant point by external force and placed at origin. Indicate direction of force on Q3 at origin.