Which of these shows unbalanced forces at work on an object? A. a car driving at a constant 25 miles per hour on a straight street B. an ice skater turning as he skates around an ice rink C. a water skier pulled by a boat at a constant 30 mph D. a bicycle chained to a bike rack at school

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

iron would move it is magnetic there is a mag field around the current in the wire

c) up is the direction the magnetic force is acting on the charge.