Magnetic Effects of Electric Current

Class 10 Science • Chapter 13

Chapter Overview

This chapter explains the magnetic effect of electric current, magnetic fields around current-carrying conductors, magnetic field lines, field due to a straight conductor and circular loop, solenoid, force on a current-carrying conductor, Fleming's Left Hand Rule, electromagnetic induction, Fleming's Right Hand Rule and electric generators.

Direction-based questions, diagrams, rules and application questions are especially important in this chapter.

📘 Complete Notes

Detailed theory of magnetic fields, field lines, straight conductor, circular loop, solenoid, electromagnetic induction and generator.

❓ Important Questions

Conceptual, reasoning, diagram-based, rule-based and competency-focused questions.

📝 Previous Year Questions

Chapter-focused previous year questions and examination practice resources.

🔢 Numericals

Current, magnetic-force, electromagnetic-induction and application-based numerical questions.

Topics Covered

Magnetic Field

Magnetic Field Lines

Properties of Magnetic Field Lines

Magnetic Field Due to Current-Carrying Conductor

Straight Current-Carrying Conductor

Right-Hand Thumb Rule

Magnetic Field Due to Circular Loop

Magnetic Field at Centre of Circular Loop

Magnetic Field Due to Solenoid

Electromagnet

Strength of Electromagnet

Force on Current-Carrying Conductor

Fleming's Left Hand Rule

Electromagnetic Induction

Fleming's Right Hand Rule

Electric Generator

Direct Current

Alternating Current

Split Ring / Commutator

Brushes and Armature

Domestic Electric Supply

Fuse and Safety

Quick Revision

Electric current produces a magnetic field around a current-carrying conductor.
Magnetic field lines around a straight conductor are concentric circles.
Direction of magnetic field can be found using the right-hand thumb rule.
A current-carrying circular loop produces a magnetic field that resembles that of a bar magnet.
A solenoid can produce a strong and comparatively uniform magnetic field inside it.
A current-carrying conductor placed in a magnetic field experiences a force.
Fleming's Left Hand Rule gives the direction of force on a current-carrying conductor.
Electromagnetic induction is the production of induced current due to a changing magnetic field.
Fleming's Right Hand Rule gives the direction of induced current.
An electric generator converts mechanical energy into electrical energy.

Important Relations

F ∝ BIL

Force on a current-carrying conductor depends on magnetic field, current and conductor length.

F = BIL sin θ

General expression for force when angle θ is between conductor and magnetic field.

I = Q/t

Electric current relation used in supporting numericals.

Fleming's Rules

Rule	Used For	Main Purpose
Fleming's Left Hand Rule	Motor effect	Finds direction of force/motion on a current-carrying conductor in a magnetic field.
Fleming's Right Hand Rule	Generator effect	Finds direction of induced current.

Electric Generator – Key Points

Works on the principle of electromagnetic induction.
Mechanical rotation is converted into electrical energy.
Main parts include armature/coil, magnetic field, brushes and slip rings or commutator depending on the type of generator.
The direction of induced current changes as the coil rotates.

Official Study Sources

Use NCERT and CBSE Academic resources for curriculum-aligned study.

NCERT Official Website → CBSE Academic Website →