A conducting bar can slide freely over two conducting rails as shown in figure below. Calculate the induced voltage in the bar. (a) If the bar is stationed at y = 1 cm and B = 14 cos 10't a, Wb/m². (b) If the bar slides at a velocity u = 21ay m/s and B = 7a, Wb/m2. (c) If the bar slides at a velocity u = 38ay m/s and B= 32 cos (10't- y) a, Wb/m?. %3D 11cm

A ten-turn solenoid has a ferromagnetic core with a relative permeability of 10,000. The length of the solenoid is l=10 cm and its cross section area is A=1 cm2.  The amount of current driving the solenoid is 0.1 A.  Determine the magnetic energy density in the core.  Provide an answer in milli Joules per cubic meter. Round off to one decimal.

1. An abrupt Si p-n junction has Na = 1017 cm³ on the p side and Na = 1016 cm³ on then side. At 300 K, (a) calculate the Fermi levels, draw an equilibrium band diagram, and find Vo from the diagram.