The Magnetic Effect of Current is one of the most important topics in Class 13 Physics and forms a strong foundation for understanding electromagnetism. This phenomenon explains how electric current produces a magnetic field around a conductor. The discovery of this effect by Hans Christian Ørsted in 1820 established a direct relationship between electricity and magnetism, leading to the development of modern electrical devices.
This topic bridges basic magnetism and advanced concepts like electromagnetic induction, making it highly relevant for NDA and CDS examinations. Understanding this chapter helps students grasp how electric motors, galvanometers, and electromagnets work.
Core Concept (Brief Explanation)
When an electric current flows through a conductor, it generates a magnetic field around it. The strength and direction of this magnetic field depend on:
- Magnitude of current
- Distance from the conductor
- Nature of the conductor
Important principles covered in this chapter include:
- Right-Hand Thumb Rule – to determine the direction of magnetic field
- Biot–Savart Law – to calculate magnetic field due to a current element
- Magnetic Field due to straight conductor, circular loop, and solenoid
- Force on a current-carrying conductor in a magnetic field
- Fleming’s Left-Hand Rule – basis of electric motors
These concepts explain how electrical energy is converted into mechanical energy.
Relevance for NDA & CDS 1 2026 Examination
For NDA and CDS 1 2026, the Magnetic Effect of Current is a high-weightage topic from the Physics section.
- Questions are often conceptual and application-based
- Frequently asked areas include:
- Direction of magnetic field
- Force on a current-carrying conductor
- Working principle of electric motor
- Simple numerical problems based on formulas
- Appears in both NDA (Class 11–12 level) and CDS (graduation-level basics)
A strong command over this topic helps in quick scoring and improves accuracy in the Physics section.
Conclusion
The Magnetic Effect of Current is a cornerstone topic in Physics that beautifully demonstrates the interconnection between electricity and magnetism. It not only explains natural phenomena but also forms the basis of many practical devices used in daily life and defense technology.
For NDA and CDS aspirants, mastering this chapter enhances conceptual clarity and problem-solving skills. A clear understanding of laws, rules, and applications will significantly boost performance in NDA CDS 1 2026 examination, making this topic both academically and competitively essential.
