An electron is moving with a speed of $1\mathrm{.}8$ x $10^8$ m$/$s towards a straight conductor from the side, perpendicular to the line of the conductor. When it is $1\mathrm{.}5$ m away a current of $25$microamps is passed through the conductor. What is the instantaneous radius of curvature of the electron's path at the moment the current is turned on$?$ Assume this takes place in a vacuum and that gravity is negligible