What Is Motional EMF?

Are you curious to know what is motional emf? You have come to the right place as I am going to tell you everything about motional emf in a very simple explanation. Without further discussion let’s begin to know what is motional emf?

Motional EMF, an intriguing phenomenon in the realm of physics, plays a pivotal role in understanding electromagnetic induction. This article delves into the intricacies of what Motional EMF is, its formula, and its significance, catering to both students and enthusiasts seeking a deeper grasp of electromagnetic principles.

What Is Motional EMF?

Motional EMF, short for electromotive force, is the voltage induced in a conductor moving through a magnetic field. This phenomenon is a fundamental aspect of electromagnetic induction and is crucial for various applications in physics and engineering.

What Is Motional EMF In Physics:

In physics, Motional EMF is a concept that falls under the broader category of electromagnetic induction. It describes the generation of an electromotive force when a conductor experiences a change in magnetic flux due to its motion in a magnetic field.

Motional EMF Formula:

The formula for Motional EMF (ε) is expressed as:



  • ε is the induced electromotive force.
  • B is the magnetic field strength.
  • v is the velocity of the conductor.
  • l is the length of the conductor perpendicular to the magnetic field.

What Is Motional EMF Class 12:

In Class 12 physics, Motional EMF is a topic covered under the chapter of Electromagnetic Induction. This chapter explores the principles of induced EMF, Faraday’s Law, and applications such as Motional EMF in generators.

Motional EMF Class 12 Which Chapter:

Motional EMF is typically covered in the chapter on Electromagnetic Induction in the Class 12 physics curriculum. This chapter provides a comprehensive understanding of the principles and applications of electromagnetic induction.

Motional EMF Derivation Pdf:

For those seeking a detailed derivation of the Motional EMF formula, educational resources in PDF format can offer step-by-step explanations. These derivations often include diagrams and mathematical steps, aiding in a more thorough comprehension of the concept.

Motional EMF Formula Class 12:

The formula for Motional EMF is a critical component in Class 12 physics. It allows students to calculate the induced voltage in a moving conductor within a magnetic field, facilitating a practical application of electromagnetic principles.


In conclusion, Motional EMF stands as a fascinating phenomenon that bridges the worlds of motion, magnetism, and electricity. Understanding its physics, formula, and its role in electromagnetic induction is pivotal for students and enthusiasts alike. As a fundamental concept in Class 12 physics, Motional EMF opens the door to a deeper comprehension of electromagnetism, laying the groundwork for exploring advanced topics and practical applications in the dynamic field of physics.


What Is Motional EMF Class12?

Motional emf is the emf induced in a conducting rod when it moves in a region of magnetic field. Motional emf is calculated by E=vBl. where B is the magnetic field and l is the length of the rod and v is the velocity of rod perpendicular to the length of the rod.

Why Is It Called Motional EMF?

This induced emf due to the motion of an electric conductor in the presence of the magnetic field is called motional emf. Thus, emf can be induced in two major ways: Due to the motion of a conductor in the presence of a magnetic field. Due to the change in the magnetic flux enclosed by the circuit.

What Is The Expression For Motional EMF?

An emf induced by the motion of the conductor across the magnetic field is a motional electromotive force. The equation is given by E = -vLB. This equation is true as long as the velocity, field, and length are mutually perpendicular.

What Is Induced EMF Class 12?

It can be defined as the generation of a potential difference in a coil due to the changes in the magnetic flux through it. In simpler words, electromotive force or EMF is said to be induced when the flux linking with a conductor or coil changes.

I Have Covered All The Following Queries And Topics In The Above Article

What Is Motional EMF In Physics

What Is Motional EMF Formula

What Is Motional EMF Class 12

Motional EMF Class 12 Which Chapter

Motional EMF Derivation Pdf

Motional EMF Formula Class 12

What Is Motional EMF