Define Biot Savart Law Class 12

Discover the Biot Savart Law, a key concept in Class 12 physics that explains magnetic fields from current-carrying wires. Explore examples, applications, and case studies.

Introduction to Biot Savart Law

The Biot-Savart Law, named after Jean-Baptiste Biot and Felix Savart, is an important principle in physics that describes the magnetic field generated by a current-carrying wire. This law is essential for understanding electromagnetic induction and is often studied in Class 12 physics.

Understanding the Biot Savart Law

The Biot Savart Law states that the magnetic field created by a current-carrying wire at a certain point is directly proportional to the current flowing through the wire and inversely proportional to the distance from the wire.

Mathematical Formulation

The mathematical expression of the Biot Savart Law is given by:

B = (µI)/(4πr) * dL x r

  • B is the magnetic field
  • µ is the magnetic permeability of the medium
  • I is the current
  • r is the distance from the wire
  • dL is the element of the wire

Applications of Biot Savart Law

The Biot Savart Law is used in various fields of physics and engineering, such as:

  • Magnetic levitation
  • Electric motors
  • Magnetic resonance imaging (MRI)
  • Electromagnetic compatibility testing


Consider a straight wire carrying a current of 2A. At a distance of 3m from the wire, the magnetic field intensity is calculated using the Biot Savart Law. Given µ = 4π x 10^-7 N/A^2, the magnetic field strength at that point is:

B = (4π x 10^-7 * 2)/(4π * 3) = 2 x 10^-7 T

Case Study

In a research study on electromagnetic compatibility testing, the Biot Savart Law was utilized to analyze the magnetic interference between electronic devices. By accurately calculating the magnetic fields generated by various devices, researchers were able to minimize the interference and improve the compatibility of the equipment.


The Biot Savart Law is a fundamental principle in electromagnetism that plays a crucial role in understanding the behavior of magnetic fields generated by current-carrying conductors. By studying this law in Class 12 physics, students can grasp the intricacies of electromagnetic phenomena and their practical applications in various fields.

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