Question

What is the initial direction of deflection for the charged particles entering the magnetic fields shown in FIGURE

Short answer

(A) The initial direction of deflection for charged particle is $+y$direction.

(b) The initial direction of deflection for charged particle is $-y$direction.

Step-by-step solution

Introduction (part a)

In a magnetic field, the force acting on a moving charge is:

$F_q=qv\times B$

A positive charge moving to the right with $\text{B}$into the page gives a force that is up using the right hand rule. Between electrically charged particles, magnetic force creates attraction or repulsion. The magnetic force between two moving charges can be described as the influence of a magnetic field formed by the other on one of the charges.

The right-hand rule (part b)

The right hand rule states that you should point your right thumb in the direction of the velocity (v), your index finger in the direction of the magnetic field (B), and your middle finger in the direction of the resulting magnetic force to determine the direction of the magnetic force on a positive moving charge.

The magnetic field

The area of space near a magnetic body or a current-carrying body where magnetic forces caused by the body or current can be detected.