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When a proton is released from rest in a...

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 `3a_(0)` toward west. The electric and magnetic fields in the room are

A

`(ma_(0))/e` west, `(2ma_(0))/(ev_(0))` down

B

`(ma_(0))/e` east, `(3ma_(0))/(ev_(0))` up

C

`(ma_(0))/e` east, `(3ma_(0))/(ev_(0))` down

D

`(ma_(0))/e` west `(2ma_(0))/(ev_(0))` up

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The correct Answer is:
A
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