Question

A negative charge particle is moving upward in a magnetic field which is towards north. The particle is deflected towards

• A. North
• B. South
• C. East
• D. West

Hint:

When using the right-hand rule for a negative charge, the direction of deflection is opposite to the thumb's direction.

Answer 1

The Correct Option is C

The force acting on a charged particle moving in a magnetic field is given by the Lorentz force equation: \[ \vec{F} = q (\vec{v} \times \vec{B}) \] Where: 
- \( \vec{F} \) is the magnetic force, 
- \( q \) is the charge of the particle, 
- \( \vec{v} \) is the velocity vector of the particle, 
- \( \vec{B} \) is the magnetic field vector. 
For a negative charge, the direction of force is opposite to that predicted by the right-hand rule. Using the right-hand rule, point your fingers in the direction of the velocity vector (\(\vec{v}\), which is upward) and curl them in the direction of the magnetic field vector (\(\vec{B}\), which is towards the North). 
Your thumb will point in the direction of the force on a positive charge. 
Since the particle is negative, the force on the particle will be in the opposite direction to the thumb. 
For this case, the force is directed towards the East. 
Thus, the particle is deflected towards East.