A very small loop antenna (a « /30) of constant current is placed a height h above a flat,perfectly conducting ground plane of infinite extent. The area plane of the

loop is parallel to the interface (x-y plane). For far-field observations (a) find the total electric field radiated by the loop in the presence of the ground plane b) all the angles (in degrees) from the vertical to the interface where the total field will vanish when the height is (c) the smallest nonzero height (in 2) such that the total far-zone field exhibits a null at an angle of 60° from the vertical