# Magnetic Effect of Electric Current, Learn about Magnetic Field Lines and Right Hand Thumb Rule

Safalta Expert Published by: Noor Fatima Updated Sat, 15 Oct 2022 08:30 AM IST

## Highlights

Here is important and relevant information regarding Class 12 Physics Concept of Magnetic Effect of Electric Current? Read the article to learn about the same.

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Magnetic Effect of Electric Current: A magnetic field is a force field created by moving electric charges and magnetic dipoles. It wields a force on other surrounding moving charges and magnetic dipoles. The magnetic field is a vector quantity as it has both direction and degree. Magnetic field lines of forces depicts the strength of a magnet and the direction of a force of a magnet. It was invented by Michael Faraday to envision the magnetic field. The direction of Magnetic field Lines inside the Magnet is from the South Pole to the North Pole.

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On the other hand, magnetic field lines move from the North Pole to the South Pole outside the magnet.

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## Magnetic Field Lines

A magnetic field line or lines of forces depicts the strength of a magnet and the direction of a force of a magnet. It was invented by Michael Faraday to envision the magnetic field.

## Direction of Magnetic field Lines

Inside the Magnet, the magnetic field lines move from the South Pole to the North Pole. On the other hand, magnetic field lines move from the North Pole to the South Pole outside the magnet.

## Strengths of Magnetic Field Lines

A straight current-carrying conductor contains a magnetic field in the pattern of concentric circles around it. Magnetic field Lines can envision the magnetic field of a straight current-carrying conductor.
• The direction of a magnetic field created due to a current-carrying conductor depends on the same direction in which the current is flowing.
• The direction of a magnetic field gets reciprocated if the direction of the electric current alters.

## Magnetic Effect of Electric Current with an Experiment

Assume a straight current-carrying conductor is draping upright, and an electric current is flowing from North to South. In this circumstance, the direction of the magnetic field will be in clockwise direction. However, if the same current is flowing from the south to north direction via the same conductor, the magnetic field will be in the anti-clockwise direction.

The direction of the magnetic field in electric current via a straight conductor can be corresponded by using the Right-hand Thumb Rule.

## Right-hand Thumb Rule

Consider that you are carrying a straight current-carrying conductor in your right hand in such a way that your Thumb points toward the direction of the current. This way, your fingers will enfold around the conductor in the direction of the magnetic field lines.

The Right-hand Thumb Rule is also referred to as Maxwell’s corkscrew rule. If we assume ourselves driving a corkscrew in the direction of the current, then the direction of the corkscrew is in the magnetic field direction.

Electric Charge
Conductors and Insulators
Basic Properties of Electric Charge
Forces between Multiple Charges
Electric Field Due to Point Charge

## Magnetic field due to the Flow of Current through a Circular Loop

The magnetic field generated in a circular current-carrying conductor is similar to that of the magnetic field because of a straight current-carrying conductor. The current carrying a circular look will act as a magnet.

The magnetic field Lines in a current-carrying conductor loop would be in the form of concentric circles. Field lines will become straight and vertical to the plane of the loop at the Centre of the circular wire.
The direction of the magnetic field in a circular loop can be identified by making use of the Right-Hand Thumb Rule.

## Magnetic field due to the Flow of Current in a Solenoid

A solenoid is a firmly wounded helical loop of wire whose diameter is smaller than its length.

The magnetic field generated by the current-carrying solenoid is the same as that of a bar magnet. The magnetic field created inside a solenoid is parallel, which is the same as that of a bar magnet. One solenoid end act as a south pole, and the other end act as a north pole.
The well-built magnetic force generated by a solenoid can be employed to attract a piece of magnetic object. The magnet, so produced, is known as an electromagnet.

## Direct current

• Direct is the unidirectional flow of electricity. The flow of this type of current does not vary regularly. The current flows in a single direction at a stable voltage in the case of direct current.
• Direct current strength is largely used in low-voltage applications like light aircraft electrical systems and charging batteries.
• A direct current can be attained from an alternating current by using a rectifier. A rectifier involves electronic units or electromechanical sections that enable current to flow only in a single direction.
• Direct current can also be transformed into alternating current by making use of an invertor or a motor generator set.
The direction of the magnetic field in electric current via a straight conductor can be illustrated by making use of the Right-Hand Thumb Rule.
Candidates can refer to the information about magnetic effect of Electric Current.

## What would be the shape of the magnetic field lines in a circular current-carrying loop?

The magnetic field Lines in a current-carrying conductor loop would be in the form of concentric circles.

## What is direct current?

Direct is the unidirectional flow of electricity. The flow of this type of current does not vary regularly. The current flows in a single direction at a stable voltage in the case of direct current.

## How can direct current be converted into alternating current?

Direct current can also be transformed into alternating current by making use of an invertor or a motor generator set.

## State Right Hand Thumb Rule.

When you a straight current-carrying conductor in your right hand in such a way that your Thumb points toward the direction of the current. This way, your fingers will enfold around the conductor in the direction of the magnetic field lines.

## What is the direction of Magnetic field Lines?

Direct current can also be transformed into alternating current by making use of an invertor or a motor generator set.

## What is an electromagnet?

The well-built magnetic force generated by a solenoid can be employed to attract a piece of magnetic object. The magnet, so produced, is known as an electromagnet.

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