A proton is initially at rest. At time $t=0,$ it is accelerated upward with an acceleration of $1\mathrm{.}7{10}^{18}\frac{m}{s^2}$ for a very short time. We make observations at location $A,15m$ from the proton as in the figure below.

$a=1\mathrm{.}7{10}^{18}\frac{m}{s^2}$

Proton

A

$-----15$ m$------1$

What is the ratio of the magnitude of the radiative electric field $($when the pulse reaches

A$)$ to the magnitude of static or Coulomb electric field at A due to the proton? Take the speed of light to be $c=3{10}^8\frac{m}{s}.$

$320$

$283\mathrm{.}333$

$146\mathrm{.}667$

$404\mathrm{.}444$

$366\mathrm{.}667$

$171\mathrm{.}111$

$346\mathrm{.}667$

$358\mathrm{.}889$

$305\mathrm{.}556$

$480$