An electron moves in a straight line at speed 250 m/s along the positive y-axis through uniform electric and magnetic fields. The magnetic field is directed into the page and has magnitude 2 T. Neglect gravity. The mass of the electron is 9.1 x 10-³1 kg. a. What is the electric field (specify both magnitude and direction)? b. Now imagine the electric field has been turned off. What will be the radius of the electron's subsequent path?

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