Magnetic Effects of Electric Current

Bookmark added to your notes.
View Notes
×

Electricity and magnetism are bound to each other, and it is proven that it produces a magnetic effect when the electric current passes through the copper wire.


Magnetic Field

The magnetic field is a quantity that has magnitude as well as direction.

A magnetic field 's direction is usually taken as the direction in which a compass needle's north pole travels inside it.

The convention is for the field lines to emerge from the north pole and merge at the south pole.

No two-magnet bar field-lines are found to cross one another. If this occurs, it implies that the compass needle will point to two directions at the point of intersection, which is not feasible.

With the increase of current through the wire, the magnitude of the magnetic field produced by an electric current at a given point increases.


Right-Hand Thumb Rule

Right-hand thumb rule, also known as Maxwell's corkscrew law, describes the direction of the magnetic field associated with a current-carrying conductor.

Right - hand thumb rule states that "Imagine holding current with a straight conductor in your right hand, so the thumb points in the current direction. Then curl your conductive fingers towards the magnetic field lines.

(Image to be added soon)


Fleming’s Left-Hand Rule

Fleming's left-hand rule says, "Stretch the left thumb, forefinger and middle finger to be perpendicular to each other. If the first finger points in the direction of the magnetic field and the second finger in the direction of the current, the thumb points in the direction of motion or the driver's force.”

The human body also produces a magnetic field, but it is minimal and about one-billionth of the magnetic field on earth.

Heart and brain are the two main organs in the human body that created the magnetic field.

The magnetic field within the human body forms the basis for obtaining images of various parts of the body.

The technique used to get the body part image is known as MRI Magnetic Resonance Imaging.


Electric Motor

  • An electric motor is a rotating system designed to transform electric power into mechanical power.

  • We have hundreds of appliances that use electric motors, such as fridges, mixers, fans, washing machines, computers, etc.

(Image to be added soon)

  • Commercial and high-performance motors are used as−

  1. An electromagnet instead of a permanent magnet.

  2. Large number of conductive wires turns in the coil bearing electrical current.

  • The soft iron core wound is known as an armature, with the coil wound and the coils wounded.

  • Armature has the main function to maximize engine power.


Electromagnetic Induction

  • In 1831, English physicist Michael Faradayx had discovered that a moving magnet could be used to generate electric currents.

  • As shown in the above image, the moving magnet towards a coil sets the current in the coil circuit indicated and read in the galvanometer needle by deflection.

  • Due to the changing magnetic field, Electromagnetic induction in a conductor produces an emf of electromotive force.

  • The galvanometer is an instrument used to detect the current present in a circuit.


Fleming’s Right-Hand Rule

  • Fleming’s right-hand rule states that “Extend the right thumb, forefinger and middle finger in order to be perpendicular to each other. 

If the forefinger indicates the magnetic field direction and the thumb indicates the conductor's motion direction, then the middle finger indicates the direction of the induced current.

(Image to be added soon)


Electric Generator

  • A generator of electricity is a device that converts mechanical energy into electric energy.

(Image to be added soon)

Mechanical energy is used in an electric generator to rotate the conductor in a magnetic field, as a result of this electricity is produced.


Types of Electric Current

  • Following are the two types of electric current are −

  1. Alternating Current 

  2. Direct Current

  • Most electric power plants generate alternating current.

  • There are various electrical devices in our homes, most of which operate on alternating current.

  • Fuse is the most important safety device in our house wiring.

  • Fuse is used to secure circuits which can damage due to the short or overloading of the circuits.

FAQ (Frequently Asked Questions)

1. What is the Definition of Magnetic Effect of Electric Current?

The term 'magnetic electrical current effect' implies that there is a magnetic field around it by an electrical current flowing into a wire

2. What is the Electric Current and Its Effect?

The temperature of wire increases as electric current passes through a conducting wire. This is called the electro current heating effect. Devices That Work on Electric Current Heating Effect: Incandescent bulb is an example of a device that works due to the heating effect of electric current.

3. What Are Two Effects of Electric Current?

Electric current has two effects; heating effect and magnetic effect. This happens because a magnetic field is generated around the wire as electric current passes through a conductive wire. The magnetic field causes the magnetic compass to deflection.

4. What Causes Current Electricity?

The flux of free electrons from one atom to another causes an electrical phenomenon. Current electricity characteristics go against those of static electricity. Wires consist of conductors like copper or aluminum.