PROBLEM 11 Consider an infinitely long cylindrical region containing a field B given in cylindrical coordinates by (p ≤ a) Bocos (wt + a) ž (p > a) where Bo = const. In other words, B is spatially con- stant over the area of the circle but harmonically oscillating in time; visualize this as being produced by an infinite ideal solenoid with an alternating cur- rent in the windings. to this alternating Find the induced E field due field and plot the result.