Magnetic force is the force exerted by a magnetic field on a moving electric charge. It is one of the fundamental forces in nature, and plays a crucial role in various phenomena, such as the behavior of magnets, the operation of electric motors, and the interaction between charged particles.

Magnetic Field

The magnetic force is a result of the interaction between magnetic fields. A magnetic field is a region around a magnet or a current-carrying conductor in which a magnetic force is experienced. The strength and direction of a magnetic field are represented by magnetic field lines.

Force on Moving Charges

When a moving charged particle enters a magnetic field, it experiences a magnetic force perpendicular to both the particle's velocity and the magnetic field direction. The magnitude of the force is given by the equation:

F = qvBsinθ

F = magnetic force (in Newtons)
q = charge of the particle (in Coulombs)
v = velocity of the particle (in m/s)
B = magnetic field strength (in Tesla)
θ = angle between the velocity and the magnetic field

Magnetic Force on Wires

When a current-carrying wire is placed in a magnetic field, it experiences a force due to the interaction between the magnetic field and the moving charges in the wire. The magnitude of the force can be calculated using the equation:

F = ILBsinθ

F = magnetic force on the wire (in Newtons)
I = current flowing through the wire (in Amperes)
L = length of the wire in the magnetic field (in meters)
B = magnetic field strength (in Tesla)
θ = angle between the current and the magnetic field

Applications

The understanding of magnetic force has numerous practical applications, including the operation of electric motors, magnetic levitation in high-speed trains, and the design of magnetic resonance imaging (MRI) machines in healthcare.

Study Guide

Understand the concept of magnetic field and its representation using field lines.
Learn the relationship between the magnetic force, the charge of a particle, its velocity, the magnetic field strength, and the angle between the velocity and the magnetic field.
Explore the applications of magnetic force in real-world scenarios, such as electric motors and magnetic levitation.
Practice calculating the magnetic force on moving charges and current-carrying wires in different orientations to the magnetic field.
Review the right-hand rule for determining the direction of the magnetic force on moving charges and current-carrying wires.

By mastering the concepts and applications of magnetic force, you will gain a deeper understanding of the fundamental principles of magnetism and electromagnetism, and their significance in various technological advancements and everyday phenomena.

◂Physics Worksheets and Study Guides High School. Light

The resources above cover the following skills:

PHYSICAL SCIENCE (NGSS)

Waves and Their Applications in Technologies for Information Transfer

Students who demonstrate understanding can:

Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media.

Evaluate the claims, evidence, and reasoning behind the idea that electromagnetic radiation can be described either by a wave model or a particle model, and that for some situations one model is more useful than the other.