# Current and Drift Velocity (multiple choice)

• predentalgirl1
In summary, the movement of accelerated electrons in a dental X-ray machine results in a westward current. This is because the majority of the acceleration contributes to the same direction, which in this case is east. However, there was some initial confusion as to whether the current could also be zero, but it has been clarified that the current is indeed westward.
predentalgirl1
[SOLVED] Current and Drift Velocity (multiple choice)

1. In a dental X-ray machine, the movement of accelerated electrons is east. The current associated with these electrons is in what direction: (a) east, (b) west, or (c) zero?

3. At first I thought it was B (west) because as the electrons(-ve charge) are moving east, it is equivalent to a +ve charge moving west, conventional current towards west. But then it seems as if the answer could be C (zero). Which answer is correct?

Accelerated electrons always constitute a current provided that majority of the acceleration contributes to the same direction, which in your case is east.

and yes.. the current is going west as u said..

I would say that the correct answer is C (zero). This is because the current is defined as the flow of charge, and in this scenario, the electrons are the charge carriers. Since they are moving east, they are not contributing to the current in the east direction, but rather in the opposite direction. Therefore, the current in this case would be considered zero. It is important to note that conventional current is defined as the flow of positive charge, so it may be misleading in this scenario.

## 1. What is current velocity?

Current velocity, also known as electric current, is the rate at which electric charge flows through a conductor or circuit. It is measured in units of amperes (A).

## 2. How is current velocity different from drift velocity?

While current velocity refers to the overall flow of electric charge, drift velocity specifically refers to the velocity of individual charged particles within a conductor. It is much slower than current velocity, as it is affected by collisions with other particles.

## 3. What factors affect drift velocity?

The drift velocity of charged particles is affected by the strength of the electric field, the resistance of the material, and the density and mobility of the particles themselves.

## 4. How is drift velocity related to current and resistance?

According to Ohm's Law, the current flowing through a conductor is directly proportional to the drift velocity of the charged particles and inversely proportional to the resistance of the material. This means that as drift velocity increases, so does current, while resistance decreases.

## 5. Can drift velocity be negative?

Yes, drift velocity can be negative. This occurs when the charged particles in a circuit are moving in the opposite direction of the electric field, such as in a battery charging a device. However, the overall current velocity is still considered positive in this case.

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