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$\frac{{m{a_0}}}{e}$ west , $\frac{{m{a_0}}}{{e{V_0}}}$ up
  • B$\;\frac{{m{a_0}}}{e}$ west , $\frac{{2m{a_0}}}{{e{V_0}}}$ down
  • C$\frac{{m{a_0}}}{e}$ east , $\frac{{3m{a_0}}}{{e{V_0}}}$ up
  • D$\frac{{m{a_0}}}{e}$ east, $\frac{{3m{a_0}}}{{e{V_0}}}$ down
AIPMT 2013, Medium
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