According to the law of conservation of energy,
a. an object loses most of its energy as friction.
b. the total amount of energy for a system stays the same.
c. the potential energy of an object is always greater than its kinetic energy.
d. the kinetic energy of an object is always greater than its potential energy.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples