A circular beam of charge of radius a consists of electrons moving with a constant speed u along the +z direction. The bean's axis is coincident with the z axis and the electron charge density is given by rhov = -cr^2, where c is a constant and r is the radial distance from the axis of the beam. a) Determine the charge density per unit length. b) Determine the current crossing the z-plane.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?