Zayra runs electric current through 38 coils of wire in a series circuit and measures a magnetic field strength of 79.3 µT around the coils. She then inserts a ferromagnetic core inside the coils to create an electromagnet and measures the magnetic field strength again. Which of the following answers would be a correct measurement

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?