A charged particle moving at constant speed is entering a region of uniform magn

Question

A charged particle moving at constant speed is entering a region of uniform magnetic field and follows the curved path shown in the diagram.


Consider each of the following changes (A-D) to this situation and select the effect it will have (1-5), from the choices given below.

A) The particle is replaced by one with twice the charge.

B) The magnetic field strength is tripled.

C) The initial velocity of the particle is halved.

D) The direction of the magnetic field is parallel to the particle's inital velocity.

1) This will alter only the direction of the magnetic force on the particle.

2) This will only increase the magnitude of the magnetic force on the particle.

3) This will only decrease the magnitude of the magnetic force on the particle.

4) This will alter both the magnitude and direction of the magnetic force on the particle.

5) This will not affect the magnetic force on the particle.

Explanation / Answer

If the particle is replaced by one with twice the charge, it will increase the magnitude of magnetic force on the particle

If the magnetic force is tripled, it will increase the magnetic force on the particle.

If the initial velocity is of particle is halved, it will decrease the magnitude of the force acting on the particle

If the direction of the force is parallel to the direction of initial velocity, it will alter both magnitude and direction of force on the particle.

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