What does energy give objects the ability to do

How would doubling the made of an object change the objects potential energy

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Determine the maximum r-value of the polar equation r =3+3 cos 0