Consider a circular loop of wire, of radius a, further carrying a sinusoidally oscillating current with a frequency of f and maximum current of Io. Calculate the resulting time-dependent on-axis magnetic field B(z,t), where t is time. Here, z is the distance along the axis perpendicular to the loop and through its centre point, in the direction z. Compute as much as is possible regarding the on-axis electric field E on the basis of the information provided.