HELP!! ASAP!! Need help with Physics!!! thanks :)?

1) Suppose a charge q is placed at point x = 0, y = 0. A second charge q is placed at point x = 7.4 m, y = 0. What charge Q must be placed at the point x = 3.7 m, y = 0 in order that the field at the point x = 3.7 m, y = 4.5 m be zero? Q = answer in q 2) An electron (q = -1.602 10-19 C) is projected... show more 1) Suppose a charge q is placed at point x = 0, y = 0. A second charge q is placed at point x = 7.4 m, y = 0. What charge Q must be placed at the point x = 3.7 m, y = 0 in order that the field at the point x = 3.7 m, y = 4.5 m be zero?

2) An electron (q = -1.602 10-19 C) is projected horizontally into the space between two oppositely charged metal plates. The electric field between the plates is 547.5 N/C, directed up.
(a) While in the field, what is the force on the electron?

(b) If the vertical deflection of the electron as it leaves the plates is 3.80 mm, how much has its kinetic energy increased due to the electric field?

3) A conducting sphere is placed within a conducting spherical shell as shown in the figure below. The conductors are in electrostatic equilibrium. The inner sphere has a radius of 1.50 cm, the inner radius of the spherical shell is 2.25 cm, and the outer radius of the shell is 2.75 cm. The inner sphere has a charge of 275 nC, and the spherical shell has zero net charge.

(a) What is the magnitude of the electric field at a point 1.75 cm from the center?