When a proton is released from rest in a room, it starts with an initial acceleration \( a_{0} \...

When a proton is released from rest in a room, it starts with an initial acceleration \( a_{0} \) towards west. When it is projected towards north with a speed \( v_{0} \) it moves with an initial acceleration \( 3 a_{0} \) towards west. The electric and magnetic fields in the room are
(a) \( \frac{m a_{0}}{e} \) east, \( \frac{3 m a_{0}}{e v_{0}} \) down
(b) \( \frac{m a_{0}}{e} \) west, \( \frac{2 m a_{0}}{e v_{0}} \) up
(c) \( \frac{m a_{0}}{e} \) west, \( \frac{2 m a_{0}}{e v_{0}} \) down
(d) \( \frac{m a_{0}}{e} \) east, \( \frac{3 m a_{0}}{e v_{0}} \) up