NEET 2013 Physics question
When a proton is released from rest in a room, it starts with an initial acceleration towards west. When it is projected towards north with a speed it moves with an initial acceleration toward west. The electric and magnetic fields in the room are -
Answer: (2)
Solution
Released from rest, the magnetic force is zero, so only the electric force acts: toward west, hence directed west (the proton is positive, so the force and field are in the same direction). This eliminates (3) and (4). Moving north with speed , the total force is toward
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