Electric potentials and electric fields1. should you use metallic or plastic coated magnets for the electrodes? why? 2.what would happen to the charges on the surface of a conductor if the electric field was not perpendicular to the surface? 3.why must you "clean: (i. e. polish) the conductors? 4.why must electric field lines always perpendicular to rquipotential lines?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?