# Electromagnetism: Forces in a Magnetic Field

### Description

This note outlines the forces encountered in a magnetic field. These include the force on a current-carrying conductor in a magnetic field, the force on a charged particle moving through a magnetic field, and the forces between currents. This is aimed at a leaving certificate student or someone who wishes to broaden their knowledge of electromagnetism.
Note by tatemae.honne, updated more than 1 year ago More Less
 Created by alex.examtime9373 over 10 years ago Copied by tatemae.honne over 10 years ago
145
4

## Resource summary

### Page 1

Force on a Current-carrying Conductor in a Magnetic FieldF = ILB This formula is only true if the flow of current is perpendicular to the magnetic field F = force I = current L = length B = magnetic flux density This force occurs because the conductor has a magnetic field around it When this magnetic field interacts with the magnetic field the conductor is placed in, the fields interact and create a force

The direction of the force can be found using Fleming's left-hand rule: Hold your thumb, first finger and second finger at right angles to one another If you place your first finger in the direction of the magnetic field, and your second finger in the direction of the current then your thumb shows the direction of the force

Force on a Charged Particle Moving through a Magnetic FieldF = qvB F = force q = charge v = velocity B = magnetic flux density

Forces between currents If two current-carrying conductors are placed in close proximity to one another, they will exert a force on each other due to their magnetic fields The unit of current, the ampere, is based on this principle The ampere is the steady current which, if maintained in two straight parallel conductors of infinite length, of negligible cross section and placed one metre apart in a vacuum would produce a force on each conductor of 2 × 10*-7 newtons per metre of length

New Page

### Similar

Using GoConqr to teach science
Waves
Forces and their effects
Forces and motion
AQA Physics P1 Quiz
GCSE AQA Physics - Unit 3
Using GoConqr to study science
GCSE AQA Physics 1 Energy & Efficiency
Junior Cert Physics formulas
OCR Physics P4 Revision
The Lymphatic System