Electromagnetism - EM Radiation

A charge particle oscillates harmonically along the x-axis as shown above. The radiation from the particle is detected at a distant point P which lies in the xy-plane. The electric field at P is in the

A. ±z direction and has a maximum amplitude at θ = 90^o
B. ±z direction and has a minimum amplitude at θ = 90^o
C. xy-plane and has a maximum amplitude at θ = 90^o
D. xy-plane and has a minimum amplitude at θ = 90^o
E. xy-plane and has a maximum amplitude at θ = 45^o

(GR8677 #53)

Solution:

Since point P lies in the xy-plane, the electric field at P also lies in the xy-plane, and its maximum amplitude is at θ = 90^o (perpendicular to the acceleration of particle).

Answer: C