Which of the following is responsible for the flow of electrons in a circuit?

electrostatic force

electromotive force

any force exerted by electromagnetic radiation

the force of a magnetic field on a static charge

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the