An electron moves along the z-axis with vz=3.0×107m/s. As it passes the origin, what are the strength and direction of the magnetic field at the following (x, y, z) positions? a) (2, 0, 0)... Bx, By, Bz = ?
b) (0, 0, 1)... Bx, By, Bz = ?
c) (0, 2, 1)... Bx, By, Bz = ?

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =