Arectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 a flowing through it. two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 t, the other two sides being perpendicular to the magnetic field.
a)what is the magnitude of the magnetic moment of the loop?
b)what torque does the magnetic field exert on the loop?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?