When electricity flows through a coil of wire, what does the resultant magnetic field resemble?
a. the magnetic field of a bar magnet.
b. the magnetic field of a horseshoe magnet.
c. the magnetic field around a straight wire.
d. the magnetic field around a circular magnetic disc.

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.