A proton is initially at rest. At time $t=0,$ it is accelerated upward with an acceleration of $20000\frac{m}{s^2}$ for a short time, $t=5{10}^{-9}s.$ We make observations at location A$,10$ m from the proton as in the figure below.

$a=20000\frac{m}{s^2}$

Take the $+x$ direction to be toward the right, the $+y$ direction to be upward, and the $+z$ direction to be out of the page $($toward you$).$

What is the direction of the electric field at location A at time $t=3\mathrm{.}16667{10}^{-8}s?$ AND What is the direction of the radiative electric field at location A at time $t=3\mathrm{.}5{10}^{-8}s?$ Choose the unit vectors corresponding to these directions. Remember that hat$(x)$ is in the positive $x-$direction and that hat$(y)$ is in the positive $y-$direction.

$+$hat$(y)$;$+$hat$(y)$

$+$hat$(y)$;$-$hat$(y)$

$+$hat$(x)$;$-$hat$(x)$

$+$hat$(x)$;$-$hat$(y)$

$-$hat$(x)$;$+$hat$(y)$

$+$hat$(x)$;$+$hat$(y)$