Question 10 of 22intermediate🔧 ApplyMCQ1 mark

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

Exercise: QUESTIONS | Q: 3 | (Page Page 10)
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Explanation

Option D is correct. According to Fleming's Left-Hand Rule, the forefinger represents the magnetic field direction, the centre finger represents the current direction (direction of positive charge movement), and the thumb represents the force direction. Since the alpha particle is positively charged and moves towards west (current direction), and it is deflected towards north (force direction), applying the left-hand rule gives the magnetic field direction as upward. The force on a current-carrying conductor (or moving charged particle) is perpendicular to both the direction of current and the magnetic field.

Solution Steps

  1. Step 1: Identify that a positively charged particle moving towards west means current direction is towards west.

  2. Step 2: The deflection towards north indicates the force direction is towards north.

  3. Step 3: Apply Fleming's Left-Hand Rule: Centre finger points west (current), Thumb points north (force).

  4. Step 4: The Forefinger (magnetic field) must point upward to satisfy the perpendicular relationship between current, magnetic field, and force.

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