# Direction of force on the charge?

• awilliam_3
In summary: Can you please clarify?In summary, a uniform electric field with magnitude E is directed in the +x-direction. When a negative charged particle is placed in the field, the force on the charge is directed upward (in the +y-direction) due to its negative charge. The acceleration of the charge is constant and directed upward, resulting in a constant x-component of velocity. Therefore, the correct answer is option E, 45 degrees above the +x-axis. The equation F=ma is not relevant in this scenario.
awilliam_3

## Homework Statement

A uniform electric field has a magnitude E and is directed in the +x-direction. A negative (-) charged particle is placed in the electric field. Determine the direction of the force on the charge.

A) +x direction
B) -x direction
C) 45 degrees below the -x axis
D) -y direction
E) 45 degrees above the +x axis
F) +y direction

F = ma

## The Attempt at a Solution

Using the x- and y-axes, the electric field is in the -y-direction and the initial velocity of the electron is in the +x-direction and the initial velocity of the electron is in the +x-direction. The electric force on the electron is upward (in the +y-direction) since it has a negative charge and is constant because the field is uniform. Thus, the acceleration of the electron is constant and directed upward. Since the acceleration is in the +y-direction, the x-component of the velocity is constant.

Thus, I chose (E) for the answer.

hi awilliam_3!
awilliam_3 said:
A uniform electric field has a magnitude E

Using the x- and y-axes, the electric field is in the -y-direction and the initial velocity of the electron is in the +x-direction and the initial velocity of the electron is in the +x-direction. The electric force on the electron is upward (in the +y-direction) since it has a negative charge and is constant because the field is uniform. Thus, the acceleration of the electron is constant and directed upward. Since the acceleration is in the +y-direction, the x-component of the velocity is constant.

i'm confused

what does velocity have to do with it?

(this isn't a magnetic field )

Oh my, now I'm confused.

## What is the direction of the force on a positive charge?

The direction of the force on a positive charge is in the direction of the electric field vector.

## How is the direction of the force on a charge determined?

The direction of the force on a charge is determined by the cross product of the electric field vector and the charge's velocity vector.

## Does the direction of the force on a charge depend on its velocity?

Yes, the direction of the force on a charge depends on its velocity as it affects the cross product calculation with the electric field vector.

## Can the direction of the force on a charge be changed?

Yes, the direction of the force on a charge can be changed by altering the electric field or the charge's velocity.

## How does the direction of the force on a charge affect its motion?

The direction of the force on a charge affects its motion by causing it to accelerate or decelerate in a specific direction, depending on the direction of the force and the charge's velocity.

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