Which of the following correctly describes a solenoid? a) the magnetic field around a solenoid is unipolar. b) the field around a solenoid is termed a bar magnet. c) a solenoid is created by winding current carrying wire into a coil. d) increasing the current in the wires will reduce the magnetic field outside of the solenoid.

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.