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When a proton is released from rest in a room, it starts with an initial acceleration ao towards west. When it is projected towards north with a speed vo it moves with an initial acceleration 3ao towards west. The electric and magnetic fields in the room are 

(a) mao/e west, 2mao/evo up

(b) mao/e west, 2mao/evo down

(c) mao/e east, 3mao/evo up

(d) mao/e east, 3mao/evo down


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