CBSE Class 10 Science Revision Notes Chapter 12 Magnetic Effects of Electric Current 2026–27
An electric current produces a magnetic field around a conductor. CBSE Class 10 Science Chapter 12 explains magnetic field lines, solenoid, Fleming’s left-hand rule and domestic electric circuits.
Magnetic Effects of Electric Current explains the link between electricity and magnetism. A current-carrying wire behaves like a magnet and produces a magnetic field around it. This idea helps explain electromagnets, force on a current-carrying conductor and safety features in domestic circuits.
Use these CBSE Class 10 Science Revision Notes Chapter 12 for the 2026–27 academic year to revise magnetic field lines, right-hand thumb rule, solenoid, electromagnet, Fleming’s left-hand rule, live wire, neutral wire, earth wire, fuse and short-circuiting.
Key Takeaways
- Magnetic effect: A current-carrying conductor produces a magnetic field around it.
- Field lines: Magnetic field lines show the direction and strength of a magnetic field.
- Solenoid: A current-carrying solenoid behaves like a bar magnet.
- Circuit safety: Fuse and earthing protect appliances and users from excess current and electric shock.
Struggling with magnetic field diagrams, direction rules and domestic circuit safety?
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CBSE Class 10 Science Revision Notes Chapter 12 on Magnetic Effects of Electric Current: Chapter Overview
Magnetic Effects of Electric Current studies the magnetic field produced by electric current. It also explains how a magnetic field exerts force on a current-carrying conductor.
| Concept | Meaning | Example |
| Magnetic effect of current | Current produces magnetic field | Compass needle deflects near a wire |
| Magnetic field | Region where magnetic force can be detected | Around a bar magnet |
| Field lines | Lines used to represent magnetic field | Field lines around a magnet |
| Solenoid | Coil of insulated wire | Electromagnet |
| Domestic circuit | Electric circuit used in homes | Live, neutral and earth wires |
Electricity and magnetism are linked. Oersted’s observation showed that a compass needle gets deflected near a current-carrying wire.
Important Topics in CBSE Notes Class 10 Science Chapter 12 Magnetic Effects of Electric Current
Class 10 Science Chapter 12 Notes include magnetic field diagrams, direction rules and safety features of electric circuits.
| Important Topic | What to Revise | Key Terms |
| Oersted’s experiment | Magnetic effect of current | Compass needle, current |
| Magnetic field lines | Direction and strength of magnetic field | North pole, south pole |
| Straight conductor | Field around current-carrying wire | Concentric circles |
| Right-hand thumb rule | Direction of magnetic field | Thumb, curled fingers |
| Circular loop | Magnetic field due to loop | Centre of loop |
| Solenoid | Uniform magnetic field inside coil | Electromagnet |
| Force on conductor | Magnetic force on current-carrying rod | Fleming’s left-hand rule |
| Domestic circuits | Household wiring and safety | Fuse, earthing, overloading |
This chapter needs diagram-based revision. Focus on direction of current, direction of magnetic field and direction of force.
Magnetic Effects of Electric Current Class 10 Notes: Oersted’s Experiment
Oersted observed that a compass needle gets deflected when electric current passes through a nearby metallic wire. This showed that current produces a magnetic field.
| Observation | Inference |
| Compass needle deflects near current-carrying wire | Current produces magnetic field |
| Needle deflection changes when current direction changes | Direction of magnetic field changes |
| Larger current gives larger deflection | Magnetic field becomes stronger |
This experiment connects electricity with magnetism. It is the starting point of Magnetic Effects of Electric Current Class 10 Notes.
Magnetic Field and Field Lines in Class 10 Science Chapter 12 Notes
A magnetic field is the region around a magnet where magnetic force can be detected. The direction of magnetic field is shown by magnetic field lines.
A compass needle behaves like a small bar magnet. Its north pole shows the direction of the magnetic field at that point.
Properties of Magnetic Field Lines
| Property | Explanation |
| Direction outside magnet | From north pole to south pole |
| Direction inside magnet | From south pole to north pole |
| Shape | Closed curves |
| Strength | Stronger where field lines are closer |
| Crossing | Field lines never intersect |
Magnetic field lines do not intersect because two directions of magnetic field cannot exist at the same point.
The magnetic field is stronger near the poles of a magnet. This is shown by crowded field lines near the poles.
Magnetic Field Due to a Current-Carrying Conductor in CBSE Class 10 Science Revision Notes Chapter 12
A current-carrying conductor produces a magnetic field around it. The pattern of this magnetic field depends on the shape of the conductor.
Magnetic Field Around a Straight Current-Carrying Conductor
A straight current-carrying conductor produces magnetic field lines in the form of concentric circles around the wire.
| Factor | Effect on Magnetic Field |
| Current increases | Magnetic field strength increases |
| Distance from wire increases | Magnetic field strength decreases |
| Current direction reverses | Magnetic field direction reverses |
The concentric circles become larger as distance from the wire increases. The direction of the magnetic field can be found using the right-hand thumb rule.
Right-Hand Thumb Rule in Magnetic Effects of Electric Current Notes
Right-hand thumb rule helps find the direction of magnetic field around a current-carrying conductor.
| Part of Right Hand | Represents |
| Thumb | Direction of current |
| Curled fingers | Direction of magnetic field lines |
Hold the conductor in the right hand with the thumb pointing in the direction of current. The curled fingers show the direction of magnetic field lines.
This rule is also called Maxwell’s corkscrew rule.
Magnetic Field Due to a Circular Loop and Solenoid in Class 10 Science Chapter 12 Notes
A current-carrying wire can be bent into a circular loop. The magnetic field pattern changes because each part of the loop contributes to the magnetic field.
Current-Carrying Circular Loop
In a circular loop, magnetic field lines are circular near the wire. At the centre of the loop, the field lines appear almost straight.
| Point in Circular Loop | Magnetic Field Pattern |
| Near the wire | Circular field lines |
| At the centre | Field lines appear straight |
| More turns in coil | Stronger magnetic field |
If a circular coil has many turns, the magnetic field becomes stronger. A coil with n turns produces a field n times stronger than a single turn, if the same current flows through each turn.
Solenoid and Electromagnet
A solenoid is a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder.
| Feature | Solenoid |
| Shape | Cylindrical coil |
| Material | Insulated copper wire |
| Field inside solenoid | Uniform magnetic field |
| Field line pattern | Similar to a bar magnet |
| Use | Making electromagnets |
One end of a current-carrying solenoid behaves like a north pole. The other end behaves like a south pole.
The magnetic field inside a solenoid is uniform because field lines are parallel and close to each other.
A soft iron piece placed inside a current-carrying solenoid becomes magnetised. The magnet formed in this way is called an electromagnet.
Force on a Current-Carrying Conductor in Magnetic Effects of Electric Current Class 10 Notes
A current-carrying conductor experiences a force when placed in a magnetic field. The direction of this force depends on the direction of current and magnetic field.
| Change Made | Effect on Force |
| Direction of current reverses | Direction of force reverses |
| Direction of magnetic field reverses | Direction of force reverses |
| Current is perpendicular to field | Force is maximum |
The force is highest when the direction of current is at right angles to the direction of magnetic field.
Fleming’s Left-Hand Rule
Fleming’s left-hand rule gives the direction of force on a current-carrying conductor placed in a magnetic field.
| Finger | Represents |
| Forefinger | Direction of magnetic field |
| Middle finger | Direction of current |
| Thumb | Direction of force or motion |
Stretch the thumb, forefinger and middle finger of the left hand so that they are mutually perpendicular. If the forefinger shows the magnetic field and the middle finger shows current, the thumb shows force.
This rule is used when current and magnetic field are perpendicular to each other.
Domestic Electric Circuits in CBSE Notes Class 10 Science Chapter 12
Domestic electric circuits supply power to appliances in homes. In India, the potential difference between live wire and neutral wire is usually 220 V.
Live Wire, Neutral Wire and Earth Wire
| Wire | Insulation Colour | Function |
| Live wire | Red | Carries current to the appliance |
| Neutral wire | Black | Completes the circuit |
| Earth wire | Green | Provides safety path for leakage current |
The earth wire is connected to a metal plate deep inside the earth. It protects users from severe electric shock when leakage current reaches the metallic body of an appliance.
Parallel Connection in Domestic Circuits
Appliances in homes are connected in parallel. This helps every appliance receive the same potential difference.
| Feature | Reason |
| Appliances connected in parallel | Each appliance gets equal potential difference |
| Separate switch for each appliance | Each appliance can be controlled independently |
| Separate circuits | High-power and low-power appliances can work safely |
Homes often use separate circuits for high-power appliances and low-power appliances.
A 15 A circuit is used for appliances such as geysers and air coolers. A 5 A circuit is used for bulbs, fans and similar appliances.
Fuse, Overloading and Short-Circuiting
An electric fuse protects appliances and circuits from excessive current. It melts when current becomes too high and breaks the circuit.
| Term | Meaning |
| Fuse | Safety device that breaks circuit during excess current |
| Overloading | Current exceeds safe limit in a circuit |
| Short-circuiting | Live wire and neutral wire come into direct contact |
| Earthing | Low-resistance path for leakage current |
Short-circuiting can happen when insulation is damaged or there is a fault in an appliance. The current suddenly increases and may damage the circuit.
Overloading can happen when too many appliances are connected to one socket or when high-power appliances draw excess current.
Important Points of Class 10 Science Chapter 12 Magnetic Effects of Electric Current
These quick notes cover the main facts from CBSE Notes Class 10 Science Chapter 12.
| Concept | Important Point |
| Magnetic effect | Current-carrying wire behaves like a magnet |
| Oersted’s observation | Compass needle deflects near current-carrying wire |
| Magnetic field | Region where magnetic force is detected |
| Field lines | Closed curves showing magnetic field direction |
| Straight conductor | Field lines are concentric circles |
| Right-hand thumb rule | Gives magnetic field direction around a conductor |
| Circular loop | Field at centre appears straight |
| Solenoid | Produces uniform magnetic field inside |
| Electromagnet | Formed by magnetising soft iron using solenoid |
| Fleming’s left-hand rule | Gives direction of force on conductor |
| Live wire | Carries current to appliance |
| Neutral wire | Completes circuit |
| Earth wire | Protects from electric shock |
| Fuse | Protects circuit from excess current |
| Short-circuiting | Live and neutral wires touch directly |
Useful Links for Class 10 Science
| Section | Useful Links |
| NCERT Solutions | NCERT Solutions for Class 10 Science |
| Important Questions | Important Questions Class 10 Science |
| Previous Year Papers | CBSE Science Question Paper Class 10 |
| NCERT Books | NCERT Books for Class 10 Science |
| Revision Notes | CBSE Class 10 Science Revision Notes |
| Syllabus | CBSE Class 10 Science Syllabus |
| Sample Papers | CBSE Sample Papers for Class 10 Science |
CBSE Class 10 Science Revision Notes
FAQs (Frequently Asked Questions)
The magnetic effect of electric current means a current-carrying conductor produces a magnetic field around it. This can be shown when a compass needle gets deflected near a wire carrying current.
Magnetic field lines are lines used to represent the direction and strength of a magnetic field. Outside a magnet, they go from north pole to south pole. They never intersect each other.
Right-hand thumb rule gives the direction of magnetic field around a current-carrying conductor. The thumb shows current direction, while the curled fingers show magnetic field direction.
A solenoid is a coil of many circular turns of insulated copper wire. When current flows through it, it behaves like a bar magnet and produces a uniform magnetic field inside.
Earthing gives leakage current a low-resistance path to the ground. It keeps the metallic body of an appliance near earth potential and protects users from severe electric shock.