The zero magnetic field at the midpoint between the traveling electron and proton suggests that they are traveling along opposite direction.
To find the answer, we need to know about the direction of magnetic field due to linear current.
What will be the direction of current for moving electron and proton?
- As electron is a negative charge, so the direction of current due to the motion of electron is along the opposite direction of its motion.
- But proton is positive charge, so the direction of current due to its motion is along the same direction.
What will be the direction of currents of two straight wires which are parallel to each other, if the magnetic field at the midpoint between them is zero?
- If, among the two wires, the left wire has upward current direction, then the magnetic field at the midpoint will be directed into the page.
- So, to cancel the magnetic field, to make the net field zero at that point, the right wire must flow the current along the same direction as left.
- Here, if the proton moves at the left along upward, then electron should flow downward at right to make the current flow upward. So that the net filed at the mid point between them is zero.
Thus, we can conclude that the electron and proton are moving along opposite direction of each other.
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