I need help with these four questions!

Q1:

1. In a particular region. the electric potential is given by V: xy22+4xy What is the electric eld in this region? Provide your answer in terms of x, y, and z. 1. In the figure below, equipotential surfaces are shown along the z-axis. The surfaces are equally spaced with V=1CICI V at z = 9.00 m, V=200 V at z = 0.50 m, and V=3DD V at z =1.CIU m. X Y {a} What is the magnitude of the electric field in this region? lb} What is the direction of the electric field? C,"- +z direction C? -2 direction 1. If the potential due to a point charge is 550 V at a distance of 19 m, what are the sign and magnitude of the charge? Q = C1. A 0.55-cm-diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed 49-pC charge on its surface. What is the potential near its surface