 # Magnetic Field Due to Current Carrying Conductor

## Introduction

• A Magnetic field is generally interpreted as a region where the force of magnetism acts.
• This force of magnetism is generally produced due to a moving charge or magnetic material.
• The origin of this interpretation dates back to the 19th century.
• During the early years of the 19th century, a scientist named H. C. Oersted discovered that a current-carrying conductor produces a magnetic effect around it.
• Although science and technology were not as developed as they are today, based on observations, it was already known that the effect of lightning and striking a ship caused the malfunctioning of compass needles, disrupting the navigation system.
• People then knew that lightning was a form of electricity and also the fact that the working of a compass is based on the earth’s magnetic field.
• This suggested a relationship between the two, the moving electric charge (current) and the magnetic field.

## To Learn about Magnetic Field Due to Current Carrying Conductor, Click on the Video Below ## Magnetic Field Due to Current Carrying Conductor

Current is generally defined as the rate of flow of charge. We already know that stationary charges produce an electric field proportional to the charge’s magnitude. The same principle can be applied here. Moving charges produce magnetic fields which are proportional to the current, and hence a current carrying conductor produces a magnetic effect around it. This magnetic field is generally attributed to the sub-atomic particles in the conductor, for e.g. the moving electrons in the atomic orbitals.

A magnetic field has both magnitude and direction. Hence, it is a vector quantity denoted by B (in the diagram below). The magnetic field due to a current-carrying conductor depends on the conductor’s current and the distance from the point. The direction of the magnetic field is perpendicular to the wire. If you wrap your right hand’s fingers around the wire with your thumb pointing in the direction of the current, then the direction in which the fingers would curl will give the direction of the magnetic field. This will be clearer with the diagram below, where the red lines represent the magnetic field lines. ## The Video About Magnetic Field Due to Cylindrical Wire ## Characteristics of Magnetic Field Due to Current Carrying Conductor

The magnetic field produced due to a current-carrying conductor has the following characteristics:

• It encircles the conductor.
• It lies in a plane perpendicular to the conductor.
• Reversal in the current flow direction reverses the field’s direction.
• Strength of the field is directly proportional to the magnitude of the current.
• Strength of the field at any point is inversely proportional to the distance of the point from the wire.

It’s difficult to comprehend the role of magnetism in our lives as we can’t see them. Take a look around, and realising its importance will not be as difficult. The motors that are used so extensively around the world, whether it’s toy cars or bullet trains or aircraft or spaceships, all use the same magnetic effect.

## Accelerate Your JEE Main & Advanced Exam Preparation by Watching this Video about Magnetism and Force on Dielectric in Charged Capacitor You might be interested in reading the following pages:

## Frequently Asked Questions – FAQs

Q1

### What is a magnetic field?

A magnetic field is a physical field that is a projection of magnetic influence on travelling charges, magnetic materials and electric currents.
Q2

### What is an electric current?

An electric current is a flow of charged particles (ions or electrons) travelling through an electrical conductor or space. It is calculated as the flow rate of electric charges through a conducting material or space.
Q3

### What is an electrical conductor?

In physics, an electrical conductor is a body that allows the flow of charges or ions in one or more directions. Electrical conductors are typically made of metals.
Q4

### What are the main characteristics of the magnetic field due to the current-carrying conductor?

It encircles the conductor. It exists in a plane perpendicular to the electrical conductor. The reversal in the current’s direction flow reverses the direction of the field. The strength of the field is directly proportional to the value of the current. The strength of the field at any point is inversely proportional to the distance of the point from the wire.
Q5

### Give a few examples of electrical conductors.

Copper, aluminium, silver, gold, mercury, steel, and iron are the few main examples of electrical conductors.

## Watch the video and solve the complete exemplar in the chapter Magnetic Effects of Electric Current Class 10 To learn more about the magnetic field, quantitative measure of the magnetic field produced due to current carrying conductor, watch the videos at “BYJU’S – The Learning App”.

Test your Knowledge on Magnetic Field Current Conductor

1. Hello, my question is this – Why change in magnetic field creates electric field and change in electric field create magnetic field?