What happens to an electric current produced from an electromagnet when the direction of the magnetic field changes?
a. the current stops.
b. the current increases.
c. the direction of the electric current changes.
d. the current decreases.
e.
the direction of the electric current stays the same.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.