1. The electric field in a bounded region is given by E(r) = k(y + z x2) where k is a constant. (a) Find the charge density in the region. X (b) Does E(r) represent an electrostatic field? Justify your answer by explicit calculation. 2. The scalar potential for an electrostatic field in a certain region is given by V(r) = E Vo cos(kx) where V and k are constants. Determine the electric field E(r) in the region.