A positive charge is initially moving in a magnetic field as shown. What is the direction of the magnetic force the charge experiences? A. Into page C. Right page D. Left E. Zero

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We start with the magnetic force on a moving charge given by

$$
\vec{F} = q\, (\vec{v} \times \vec{B}),
$$

where $$q$$ is the charge, $$\vec{v}$$ is the velocity, and $$\vec{B}$$ is the magnetic field.

Since the charge is positive, the direction of $$\vec{F}$$ is the same as that given by the right‐hand rule.

Step 1. Identify the directions from the diagram.  
Assume the diagram shows the velocity $$ \vec{v} $$ directed upward and the magnetic field $$ \vec{B} $$ directed to the right.

Step 2. Apply the right-hand rule.  
- Point your index finger in the direction of $$ \vec{v} $$ (upward).  
- Point your middle finger in the direction of $$ \vec{B} $$ (to the right).  
- Your thumb will then point in the direction of $$ \vec{v} \times \vec{B} $$.

Step 3. Determine the force direction.  
Following the above, your thumb points into the page.

Thus, the magnetic force on the positive charge is directed

$$
\boxed{\text{Into page}}.
$$

The correct answer is Option A.
The magnetic force on the positive charge is directed into the page.

A positive charge is initially moving in a magnetic field as shown. What is the direction of the magnetic force the charge experiences? A. Into page C. Right page D. Left E. Zero

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