# True/False: Magnetic Field

• kungshoey
In summary, the statements b, c, d, and e are true. The force on a charged particle in a magnetic field is dependent on the magnitude of its velocity and can be in the direction of the field. The magnetic field can also increase the kinetic energy of a positively charged particle. These conclusions can be drawn from the Lorentz force law, which can be found in most textbooks or notes. The right hand rule can also be used to determine the direction of the force and the implications for acceleration of the charged particle.

#### kungshoey

2. Which of the following statements are true:
a. a charged particle moving in a constant magnetic field can not have its speed increased by that field.
b. the force on a charged particle moving in a magnetic field depends only on the magnitude of the velocity, not on its direction.
c. the force on a charged particle moving in a magnetic field is independent of the velocity.
d. the effect of a magnetic field on a charged particle is to increase its Kinetic Energy if the particle is positively charged
e. the force on a charged particle moving in a magnetic field can be in the direction of the field
f. a magnetic field leads to the constant acceleration of charged particles.

Welcome to PF.
Show Some Work.

You need to think of the Right Hand Rule and the implications to acceleration of a charged particle.

ALL of these questions can be answered by looking at the form of the equation that describes the force on a charged particle due to a magnetic field. It is called the Lorentz force law, and it should be in your book or in your notes.

## 1. What is a magnetic field?

A magnetic field is a region around a magnet or an electric current where a magnetic force can be detected.

## 2. How is a magnetic field created?

A magnetic field is created by moving electric charges, such as in a current-carrying wire or in the atoms of a magnet.

## 3. Can a magnetic field be seen?

No, a magnetic field cannot be seen with the naked eye. However, its effects can be observed with the use of tools such as a compass.

## 4. Is Earth's magnetic field constant?

No, Earth's magnetic field is not constant. It changes in strength and direction over time, and can even reverse its polarity.

## 5. How are magnetic fields used in everyday life?

Magnetic fields are used in a variety of ways in everyday life, such as in generators and motors, credit and debit cards, and magnetic resonance imaging (MRI) machines in medical settings.