Question 3-65J3

An excited antenna, such as a 1/2 wavelength dipole, operates by having oscillating currents and voltages along its elements. The oscillating currents generate a changing magnetic field, while the oscillating charges (due to voltage) generate a changing electric field. These two fields – the electro-magnetic (magnetic component) and electro-static (electric component) – are inextricably linked. They propagate together as an electromagnetic wave, perpendicular to each other and to the direction of propagation. Therefore, any antenna producing radiation will generate both types of fields simultaneously. Option B is incorrect because a propagating electromagnetic wave fundamentally consists of *both* electric and magnetic fields; one cannot exist without the other in free space. Options A and D use non-standard or imprecise terminology ("residual fields," "electro-flux field") to describe the antenna's primary output.