eduphysics
CBSE AND NEET
MOTIONAL EMF-INTRODUCTION
When a conductor moves through a magnetic field, it generates an electric field. This electric field can then cause the conductor to conduct current, which produces power.
The fundamental ideas in the study of electromagnetism that have a wide variety of real-world applications are motional emf and induced current.Applications include transformers, sensors, eddy current brakes, magnetic levitation, electric motors, generators, and electric motors.
These ideas are fundamental to the design and optimisation of a variety of magnetic devices that result in effective and sustainable energy solutions.The principles of motional emf, induced current, and power usage will be discussed in this article.
MOTIONAL EMF
The emf actuated across the closures of a conductor because of its movement in a magnetic field is called motional emf.
MOTIONAL EMF – DESCRIPTION
Conductor PQ of length L is allowed to continue on a U-moulded leading rails. (Here the slidable conductor PQ is moved outwards with a speed v).When the conductor moved outwards the space of the rectangular circle increments and so the attractive transition connected with the shut circle increments. Thus,the magnetic flux linked with the closed-loop increases.
An emf is set up across the conductor PQ due to which an initiated current stream in the anticlockwise course (as displayed in the image).According to Faraday’s law of electromagnetic induction the emf incited is – BLv
MAGNETIC FLUX LINKED WITH THE CLOSED-LOOP
INDUCED EMF
INDUCED CURRENT
LENZ’S LAW
Lenz’s law expresses that, » The direction of the actuated current in a circuit is with the end goal that it goes against the reason which produces it ».
POWER USED
RIGHT HAND PALM RULE
FLEMING’S RIGHT HAND RULE
Numerical on motional emf
CONCLUSION
In the study of electromagnetism, it is essential to understand terms like motional emf, induced current, and power utilised. These ideas are crucial for the creation, use, and optimisation of several electromagnetic devices. We create more sustainable and effective energy solutions, such as renewable energy sources, by comprehending these ideas.
The study of motional emf, induced current, and power utilised as a used as an essential field of research for the future as the demand for efficient and dependable electromagnetic devices will continue to develop.
Links to this topic:
Faraday’s laws of electromagnetic induction
Electromagnetic induction-Investigatory projects
Lenz’s law and induced current in magnetic fields
Frequently Asked Questions
- What is motional emf and induced current?
- What factors affect the amount of induced emf?
- When is the strength of the induced emf maximum?
- What is motional emf ? Derive an expression for it.
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