Verified Solution • 2025–26 Session moderate

QNEET-2013-Ph-1490: NEET 2013 Physics - Class 12 NEET-2013-Ph-1490 Solution: When a proton is released from rest in a room it starts with an …

When a proton is released from rest in a room it starts with an initial acceleration a0a_0 towards west. When it is projected towards north with a speed v0v_0 it moves with an initial acceleration 3a03a_0 towards west. The electric and magnetic fields in the room are ma0e\frac{ma_0}{e} east 3ma0ev0\frac{3ma_0}{ev_0} up ma0e\frac{ma_0}{e} east 3ma0ev0\frac{3ma_0}{ev_0} down ma0e\frac{ma_0}{e} west 2ma0ev0\frac{2ma_0}{ev_0} up ma0e\frac{ma_0}{e} west 2ma0ev0\frac{2ma_0}{ev_0} down

Multiple Choice Options

  • A ma0e{{m{a_0}} \over e} e m a 0 _ _ east,   3ma0ev0{{3m{a_0}} \over {e{v_0}}} e v 0 _ 3 m a 0 _ _ up
  • B ma0e{{m{a_0}} \over e} e m a 0 _ _ east,   3ma0ev0{{3m{a_0}} \over {e{v_0}}} e v 0 _ 3 m a 0 _ _ down
  • C ma0e{{m{a_0}} \over e} e m a 0 _ _ west,   2ma0ev0{{2m{a_0}} \over {e{v_0}}} e v 0 _ 2 m a 0 _ _ up
  • D ma0e{{m{a_0}} \over e} e m a 0 _ _ west,   2ma0ev0{{2m{a_0}} \over {e{v_0}}} e v 0 _ 2 m a 0 _ _ down

Step-by-Step Verified Solution

When moves with an acceleration a 0 towards west, electric field E = F q = m a 0 e ( W e s t ) When moves with an acceleration 3a 0 towards east, magnetic field B = 2 m a 0 e v 0 ( d o w n w a r d )

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