A half wavelength dipole is kept in the x-y plane and oriented along 45° from the x-axis. Determine the direction of null in the radiation pattern for 0≤φ≤π Here the angle θ (0≤θ≤π) is measured from the z-axis, and the angle φ (0≤φ≤2π) is measured from the x-axis in the x-y plane.