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Magnetic Effects of Electric Current, Class 10 Chapter 13 Science Notes

Magnetic Effects of Electric Current, CBSE Class 10 Chapter 13 Science Notes are the best study materials. Here students can find in detail explanations for every terminologies provides in this chapter.

Introduction to Chapter 13 Magnetic Effects of Electric Current

The class 10 science chapter 13 focusses on magnetic fields and electromagnetic effects. How the magnetic effect of electric current is applied to electromagnets and electric motors are examined in the chapter.

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Magnetic Field and Field Lines

Magnet

A magnet is a material that produces a field that attracts or repels other such materials of magnetic nature.

Lodestone is a naturally occurring magnet. It attracts materials like Iron, Nickel, Cobalt, etc.

A magnet is always bipolar with poles named north and south poles. These two poles always exist together and can not be separated. North pole of a magnet is the side which points to Earth’s geographic north when it is freely suspended.

Similar to charges, poles attract and repel. Like poles repel while unlike poles attract each other.

To know more about Magnet, visit here.

Bar magnet

A bar magnet is a rectangular object, composed of iron, steel or any form of a ferromagnetic substance, that shows permanent magnetic properties. It has two different poles, a north and a south pole such that when suspended freely, the north pole aligns itself towards the geographic north pole of the Earth.

Magnetic field

The region around a magnet where its magnetic influence can be experienced is called a magnetic field. The direction and strength of a magnetic field are represented by magnetic lines of force.

For More Information On Magnetic Field and Magnet Field Lines, Watch The Below Video:

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To know more about Magnetic Field, visit here.

Magnetic field lines

Magnet’s magnetic field lines result in the formation of continuous/running closed loops.

The tangent to the field line at any given point indicates the direction of the total magnetic field at that point.

The greater the number of field lines crossing per unit area, the higher the intensity, the stronger the magnitude of the magnetic field.

There is no intersection between the magnetic field lines.

Magnetic field lines for a closed loop

Since magnets have dipoles, magnetic field lines must originate and end. Therefore by convention, it starts at the north pole and moves towards the south pole outside the bar magnet and from south → north inside the magnet. Hence, it forms closed loops. The closer or denser the magnetic field lines, greater is the magnetic field’s strength.

Iron filings test around a bar magnet

Iron filings around a bar magnet exhibit the magnetic field lines that engirdle the bar magnet. The magnetic field lines can be explained as imaginary lines that graphically represents the magnetic field that is acting around any magnetic substance.

Magnetic field lines do not intersect as there will be two tangential magnetic field directions associated with the same point, which does not occur. If a compass needle is placed at that point, it will show two different directions of the magnetic field which is absurd.

To know more about Properties of Magnetic Field Lines, visit here.

Magnetic Field Due to a Current Carrying Conductor

Oersted’s experiment

When electric current flows through a current carrying conductor, it produces a magnetic field around it. This can be seen with the help of a magnetic needle which shows deflection. The more the current, the higher the deflection. If the direction of current is reversed, the direction of deflection is also reversed.

Electromagnetism and electromagnet

An electromagnet is an artificial magnet which produces a magnetic field on the passage of electric current through a conductor. This field disappears when the current is turned off. The phenomenon of producing or inducing a magnetic field due to the passage of electric current is called electromagnetism.

स्रोत : byjus.com

Magnetic Effects of Electric Current Class 10 Notes Science Chapter 13

CBSE Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current Pdf free download is part of Class 10 Science Notes for Quick Revision. Here we have given NCERT Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current.

Magnetic Effects of Electric Current Class 10 Notes Science Chapter 13

June 15, 2022 by Sastry CBSE

CBSE Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current Pdf free download is part of Class 10 Science Notes for Quick Revision. Here we have given NCERT Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current. According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks.

CBSE Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current

Magnet: Magnetic field and magnetic field lines, Magnetic field due to a current carrying conductor, Right hand thumb rule, Magnetic field due to current through a circular loop. Magnetic field due to current in a solenoid.

Magnet is an object that attracts objects made of iron, cobalt and nickle. Magnet comes to rest in North – South direction, when suspended freely.

Use of Magnets: Magnets are used

in refrigerators.

in audio and video cassette players.

in children’s toys and;

on hard discs and floppies of computers.

Properties of Magnet

A free suspended magnet always points towards the north and south direction.

The pole of a magnet which points toward north direction is called north pole or north-seeking.

The pole of a magnet which points toward south direction is called south pole or south seeking.

Like poles of magnets repel each other while unlike poles of magnets attract each other.

Magnetic field: The area around a magnet where a magnetic force is experienced is called the magnetic field. It is a quantity that has both direction and magnitude, (i.e., Vector quantity).

Magnetic field and field lines: The influence of force surrounding a magnet is called magnetic field. In the magnetic field, the force exerted by a magnet can be detected using a compass or any other magnet.

The magnetic field is represented by magnetic field lines.

The imaginary lines of magnetic field around a magnet are called field line or field line of magnet. When iron fillings are allowed to settle around a bar magnet, they get arranged in a pattern which mimicks the magnetic field lines. Field line of a magnet can also be detected using a compass. Magnetic field is a vector quantity, i.e. it has both direction and magnitude.

Direction of field line: Outside the magnet, the direction of magnetic field line is taken from North pole to South Pole. Inside the magnet, the direction of magnetic field line is taken from South pole to North pole.Strength of magnetic field: The closeness of field lines shows the relative strength of magnetic field, i.e. closer lines show stronger magnetic field and vice – versa. Crowded field lines near the poles of magnet show more strength.

Properties of magnetic field lines

(i) They do not intersect each other.

(ii) It is taken by convention that magnetic field lines emerge from North pole and merge at the South pole. Inside the magnet, their direction is from South pole to North pole. Therefore magnetic field lines are closed curves.

Magnetic field lines due to current a current carrying straight conductor

A current carrying straight conductor has magnetic field in the form of concentric circles, around it. Magnetic field of current carrying straight conductor can be shown by magnetic field lines.

The direction of magnetic field through a current carrying conductor depends upon the direction of flow electric current.

Let a current carrying conductor be suspended vertically and the electric current is flowing from south to north. In this case, the direction of magnetic field will be anticlockwise. If the current is flowing from north to south, the direction of magnetic field will be clockwise.

The direction of magnetic field, in relation to direction of electric

current through a straight conductor can be depicted by using the Right Hand Thumb Rule. It is also known as Maxwell’s Corkscrew Rule.

Right-Hand Thumb Rule: If a current carrying conductor is held by right hand, keeping the thumb straight and if the direction of electric current is in the direction of thumb, then the direction of wrapping of other fingers will show the direction of magnetic field.

Maxwell’s Corkscrew rule: As per Maxwell’s Corkscrew Rule, if the direction of forward movement of screw shows the direction of the current, then the direction of rotation of screw shows the direction of magnetic field.

स्रोत : www.learncbse.in

Notes of Ch 13 Magnetic Effects of Electric Current

Study Material and Notes of Ch 13 Magnetic Effects of Electric Current Class 10th Science

Notes of Ch 13 Magnetic Effects of Electric Current| Class 10th Science

12 Aug, 2017

Study Material and Notes of Ch 13 Magnetic Effects of Electric Current Class 10th Science

Topics in the Chapter

• Introduction

• Properties of magnet

→ Characteristics of Field lines

→ Magnetic Field of a Bar Magnet

• Right Hand Thumb Rule

• Magnetic Field due to current through a Straight conductor

• Magnetic field due to Current through a Circular Loop

→ Factors affecting magnetic field of a circular current carrying conductor

• Solenoid

→ Directionof magnetic field

• Electromagnet • Permanent Magnet

• Force on a current carrying conductor in a Magnetic field

• Fleming's Left Hand Rule

→ MRI (Magnetic Resonance imaging)

→ Galvanometer

• Electric Motor and its working

→ Commutator → Armature

→ Commercial use of electric motors

• Electro magnetic Induction

• Fleming's Right Hand Rule

• Electric Generator and its working

• Alternate Current (A.C.)

• Direct current (D.C.)

• Domestic Electric Circuits

→ Safety devices

Introduction

→ Magnet is any substance that attracts iron or iron-like substances.

→ An electric current-carrying wire behaves like a magnet.

→ Electromagnets and electric motors involve the magnetic effect of electric current, and electric generators involve the electric effect of moving magnets.

→ Compass needle get deflected on passing an electric current through a metallic conductor.

Properties of Magnet

(i) Every magnet has two poles i.e. North and South.

(ii) Like poles repel each other.

(iii) Unlike poles attract each other.

(iv) A freely suspended bar magnet aligns itself in nearly north-south direction, with its north pole towards north direction.

Characteristics of Field Lines

→ Field lines arise from North pole and end into South pole of the magnet.

→ Field lines are closed curves.

→ Field lines are closer in stronger magnetic field.

→ Field lines never intersect each other as for two lines to intersect, there must be two north directions at a point, which is not possible.

→ Direction of field lines inside a magnet is from South to North.

→ The relative strength of magnetic field is shown by degree of closeness of field

lines.

Magnetic Field of a Bar Magnet

→ H. C. Oersted was the first person to state that electric current has magnetic field.

Right Hand Thumb Rule

→ Imagine you are holding a current carrying straight conductor in your right hand such

that the thumb is pointing towards the direction of current.

→ Then the fingers wrapped around the conductor give the direction of magnetic field.

Magnetic Field due to Current through a Straight Conductor

→ It can be represented by concentric circles at every point on conductor.

→ Direction can be given by right hand thumb rule or compass.

→ Circles are closer near the conductor.

→ Magnetic field ∝ Strength of current.

→ Magnetic field ∝ 1/Distance from conductor

Magnetic Field due to Current through a Circular Loop

→ It can be represented by concentric circle at every point.

→ Circles become larger and larger as we move away.

→ Every point on wire carrying current would give rise to magnetic field appearing as straight line at centre of the loop.

→ The direction of magnetic field inside the loop is same.

Factors affecting magnetic field of a circular current carrying conductor

→ Magnetic field ∝ Current passing through the conductor

→ Magnetic ∝ 1/Distance from conductor

→ Magnetic field ∝ No. of turns in the coil

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