Q132 / 270 · NDA 2020 · General Ability

Consider the following image : Figure
A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be

  • A
    to the right
  • B
    to the left
  • C
    out of the page
  • Correct answer
    D
    into the page

Solution

We know that both the directions are perpendicular, thus for force direction $=$ ? Using Fleming's left hand rule, Direction of force is perpendicular to the direction of magnetic field and current. Thus direction of force is opposite to electron motion into the page at $90^{\circ}$.

Hence, the correct answer is option: 'D'.

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