A 75-turn, 10.0 cm diameter coil rotates at an angular velocity of 9.00 rad/s in a 1.25 T field, starting with the plane of the coil parallel to the field. At what time is the induced emf first at its most negative

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?