The correct answer is (c) decreases because the charge moves along the electric field. A positively charged particle in a uniform electric field experiences a force in the direction of the field. As it accelerates, its kinetic energy increases, causing ...

The correct answer is (a) spheres. At a great distance from a collection of charges with a nonzero net charge, the system behaves like a point charge. The equipotential surfaces around a point charge are spherical, since the electric potential ...

The correct answer is (d) on the x-y plane for a given z. In a uniform electric field along the z-direction, the electric potential depends only on z and remains constant for any x and y at a fixed z. ...