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Faraday’s Law of Induction

SVIT. Faraday’s Law of Induction. GUIDED BY- MRS. PRIYANKA THAkre. SVIT. MEMBERS ARE………… TANVI SINGH 13BEECV121 CHARMI SHAH 13BEECV125 NIKITA TAHILIANI 13BEECG073 AKANKSHA 13BEECG082. SVIT. REFERANCE LINK…………….

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Faraday’s Law of Induction

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  1. SVIT Faraday’s Law of Induction GUIDED BY- MRS. PRIYANKA THAkre

  2. SVIT • MEMBERS ARE………… • TANVI SINGH 13BEECV121 • CHARMI SHAH 13BEECV125 • NIKITA TAHILIANI 13BEECG073 • AKANKSHA 13BEECG082

  3. SVIT REFERANCE LINK……………. http://www.google.co.in/ur/?sa=t&rct=&esrc=s&source=web&cd=&ved=ocdaqf!AB&url=http%3A%2A%2Fweb

  4. SVIT Contents….. Induced Electromotive Force Magnetic Flux Faraday’s Law of Induction Lenz’s Law Mechanical Work and Electrical Energy

  5. SVIT Induced Electromotive Force Faraday’s experiment: closing the switch in the primary circuit induces a current in the secondary circuit, but only while the current in the primary circuit is changing.

  6. SVITElectromagnetic Induction

  7. SVIT Magnetic Flux: • The product of the field and area perpendicular to the field is the magnetic flux. • The magnetic flux is measured in webers. • 1 Wb = 1 T m2 • The magnetic field can be thought of as a flux density.

  8. SVIT Faraday stated two laws: FIRST LAW: Whenever the magnitude flux linked with a circuit changes, an e.m.f is always induced in it……

  9. SVIT • Second law: The magnitude of induced e.m.f is equal to the rate of change of flux-linkages

  10. SVIT Faraday’s Law • This phenomena is called electromagnetic induction and is described by Faraday’s law. Write Faraday’s law. • In order to understand Faraday’s law we need to understand the concept of magnetic flux. Write the definition of magnetic flux.

  11. SVIT Faraday’s Law Does it make a difference if it is the magnetic moving or the coil? This was a major point in Einstein’s theory of relativity.

  12. The flux can be used to get the induced emf. This is Faraday’s Law of induction. For multiple turns the emf is multiplied. N turns of wire NF is the flux linkage • SVIT Faraday’s Law:

  13. SVIT Flemings right hand thumb rule!!!

  14. SVIT Lenz’s Law • The direction of the emf and thus the current is given by Lenz’s law. We use this to find the direction of the current. If you are looking down on the loop from above, it is the current flowing in clockwise direction

  15. SVIT Lenz’s Law The magnetic is moving away from the coil so the magnetic field is decreasing, thus the current is in a direction to off-set the decrease. The magnetic is moving toward the coil so the magnetic field is increasing, thus the current is in a direction to off-set the increase.

  16. SVIT

  17. SVIT Minus Sign? Lenz’s Law Induced EMF is in direction that opposesthe change in flux that caused it

  18. SVIT Lenz’s Law Lenz’s Law An induced current always flows in a direction that opposes the change that caused it. Therefore, if the magnetic field is increasing, the magnetic field created by the induced current will be in the opposite direction; if decreasing, it will be in the same direction.

  19. SVIT Lenz’s Law This conducting rod completes the circuit. As it falls, the magnetic flux decreases, and a current is induced.

  20. SVIT Lenz’s Law The force due to the induced current is upward, slowing the fall.

  21. SVIT Lenz’s Law Currents can also flow in bulk conductors. These induced currents, called eddy currents, can be powerful brakes.

  22. SVIT Mechanical Work and Electrical Energy This diagram shows the variables we need to calculate the induced emf.

  23. SVIT Mechanical Work and Electrical Energy If the rod is to move at a constant speed, an external force must be exerted on it. This force should have equal magnitude and opposite direction to the magnetic force:

  24. SVIT Thank you……..for all your co-operation……..

  25. SVIT Have a good day…………!!!

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